Large changes to the LLCurl::Responder API, as well as pulling in some changes to common libraries from the server codebase:

* Additional error checking in http handlers.
* Uniform log spam for http errors.
* Switch to using constants for http heads and status codes.
* Fixed bugs in incorrectly checking if parsing LLSD xml resulted in an error.
* Reduced spam regarding LLSD parsing errors in the default completedRaw http handler.  It should not longer be necessary to short-circuit completedRaw to avoid spam.
* Ported over a few bug fixes from the server code.
* Switch mode http status codes to use S32 instead of U32.
* Ported LLSD::asStringRef from server code; avoids copying strings all over the place.
* Ported server change to LLSD::asBinary; this always returns a reference now instead of copying the entire binary blob.
* Ported server pretty notation format (and pretty binary format) to llsd serialization.

* The new LLCurl::Responder API no longer has two error handlers to choose from.  Overriding the following methods have been deprecated:
** error - use httpFailure
** errorWithContent - use httpFailure
** result - use httpSuccess
** completed - use httpCompleted
** completedHeader - no longer necessary; call getResponseHeaders() from a completion method to obtain these headers.

* In order to 'catch' a completed http request, override one of these methods:
** httpSuccess - Called for any 2xx status code.
** httpFailure - Called for any non-2xx status code.
** httpComplete - Called for all status codes.  Default implementation is to call either httpSuccess or httpFailure.
* It is recommended to keep these methods protected/private in order to avoid triggering of these methods without using a 'push' method (see below).

* Uniform error handling should followed whenever possible by calling a variant of this during httpFailure:
** llwarns << dumpResponse() << llendl;
* Be sure to include LOG_CLASS(your_class_name) in your class in order for the log entry to give more context.

* In order to 'push' a result into the responder, you should no longer call error, errorWithContent, result, or completed.
* Nor should you directly call httpSuccess/Failure/Completed (unless passing a message up to a parent class).
* Instead, you can set the internal content of a responder and trigger a corresponding method using the following methods:
** successResult - Sets results and calls httpSuccess
** failureResult - Sets results and calls httpFailure
** completedResult - Sets results and calls httpCompleted

* To obtain information about a the response from a reponder method, use the following getters:
** getStatus - HTTP status code
** getReason - Reason string
** getContent - Content (Parsed body LLSD)
** getResponseHeaders - Response Headers (LLSD map)
** getHTTPMethod - HTTP method of the request
** getURL - URL of the request

* It is still possible to override completeRaw if you want to manipulate data directly out of LLPumpIO.

* See indra/llmessage/llcurl.h for more information.

removed a couple more unnecessary string copies from unfortunate LLSD behavior.
reviewed with simon, post review from Richard.

Per Monty's code review, it's dubious practice to have a class in which
certain members are sometimes visible, other times not. If these were virtual
methods, or non-static data members, the error would be obvious -- but even
with static data members and non-virtual methods, it looks like an ODR
violation. Extract conditional methods as free functions, as in changeset
07cd70e75473.

Changeset 07cd70e75473 moved LLSD::outstandingCount() and allocationCount() to
free functions so we could turn their visibility on/off via LLSD_DEBUG_INFO.
But on some platforms, without proper LL_COMMON_API declarations visible when
we compile llsd.cpp, those free functions lack proper linkage directives.
Declare LLSD_DEBUG_INFO in llsd.cpp so that when the llcommon library is
built, the free functions get proper linkage -- independent of compilations of
LLSD consumers.

Free functions can be unconditionally compiled into the .o file, but
conditionally hidden in the header file. Static class methods don't have that
flexibility: without a declaration in the header file, you can't compile a
function definition in the .cpp file. That makes it awkward to use the same
llcommon build for production and for unit tests.
Why make the function declarations conditional at all? These are debugging
functions. They break the abstraction, they peek under the covers. Production
code should not use them. Making them conditional on an #ifdef symbol in the
unit-test source file means the compiler would reject any use by production
code. Put differently, it allows us to assert with confidence that only unit
tests do use them.
Put new free functions in (lowercase) llsd namespace so as not to clutter
global namespace.
Tweak the one known consumer (llsd_new_tut.cpp) accordingly.

This establishes that there are no viewer-side unit tests relying on these
methods. The point is to try to clean up the LLSD public API. In the same
vein, remove from LLSD public API a diagnostic method which is nothing more
than an implementation detail for the corresponding LLSD::Impl method. The
same effect can be achieved by making LLSD::Impl a friend of LLSD, moving the
method with the messy signature (classic-C arrays!) into LLSD::Impl itself.

per Monty code review

Because new enum values have been added to the LLSD type field, a few external
switch statements must be adjusted to suppress fatal warnings, even though we
never expect to encounter an LLSD instance containing any of the new values.

I made it about a year and a half ago; Zero found it while reading code. I had added a return value to LLSD::insert(), but a) did it wrong, and b) broke the STL-like semantics of insert(). So I've put insert() back to returning void and created LLSD::with(), which does what my earlier insert() did. The compiler then caught all the cases where insert()'s return value were being used, and I changed those to use with() instead.

DEV-11254 DEV-11254 DEV-2003: DEV-21567 DEV-37301 EXT-104 EXT-138 EXT-217 EXT-256 EXT-259 EXT-259 EXT-328 EXT-348 EXT-386 EXT-399 EXT-403 EXT-460 EXT-492 EXT-492 EXT-531 EXT-537 EXT-684

improved text editor (handles multiple fonts simultaneously as well as inline widgets)

merged all changes, post copy, from the following branches:
linden/brachnes/enable-o-v
user/cg/qar-1538
user/mani/viewer2-enable-o-v

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

svn merge -r106715:HEAD svn+ssh://svn.lindenlab.com/svn/linden/branches/q/notifications-merge-r106715 .  QAR-1149 -- Final merge of notifications to trunk.

dataserver-is-deprecated
for-fucks-sake-whats-with-these-commit-markers

svn merge -r87349:87423 svn+ssh://svn.lindenlab.com/svn/linden/branches/escrow/liquid-banjo-03-merge release dataserver-is-deprecated

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.

I added a #ifndef hack to v3math.h to eliminate LLString's from the llhavok project.
I also removed lluuid.h's dependency on LLString (using std::string) instead and
then fixed a bunch of bad dependency fallout on a few files around the project
that suddenly lost their hidden access to some fundamental includes.
The important parts were reviewed with James.

concludes (fixes) SL-31187
pair programmed and reviewed by markl and karen