Use LLStringUtil::getenv() or getoptenv() whenever we fetch a string that will
be used as a pathname.

Use LLFile::tmpdir() instead of getenv("TEMP").

As an added extra-special bonus, finally clean up $TMP/llcontrol-test-zzzzzz
directories that have been accumulating every time we run a local build!

On Windows, when logged in with a non-ASCII username, every one of the three
documented APIs -- SHGetSpecialFolderPath(), SHGetFolderPath() and
SHGetKnownFolderPath() -- fails to retrieve any pathname at all. We cannot
account for the fact that the oldest of these continues to work with the
release viewer and within a Python script (though not, curiously, from a
Python interactive session). With a non-ASCII username, they consistently fail
when called from an Alex Ivy viewer build: "The filename, directory name, or
volume label syntax is incorrect."

Empirically, with a non-ASCII username, the preset APPDATA and LOCALAPPDATA
environment variables are also useless, e.g. c:\Users\??????\AppData\Roaming
where those are, yup, actual question marks.

Empirically, the VMP is able to successfully call SHGetFolderPath() to
retrieve both AppData\Roaming and AppData\Local. Therefore, we make the VMP
set the APPDATA and LOCALAPPDATA environment variables to the UTF-8 encoded
correct pathnames. Instead of calling SHGetSomethingFolderPath() at all, make
LLDir_Win32 retrieve those environment variables.

Make LLFile::mkdir() treat "directory already exists" as a success case. Every
single call fell into one of two categories: either it didn't check success at
all, or it tested specially to exempt errno == EEXIST. Migrate that test into
mkdir(); eliminate it from call sites.

Make LLDir::append() and add() convenience functions accept variadic
arguments. Replace add(add()...) constructs, as well as clumsy concatenations
of directory names and getDirDelimiter(), with simple variadic add() calls.

and open() methods. The only remaining value added by ll[io]fstream over
std::[io]stream is proper handling of non-ASCII pathnames, which can be done
by deriving from std::[io]stream, converting pathname strings and passing them
to the corresponding base-class methods.
This is only necessary on Windows. On Posix, ll[io]fstream are already
typedefs for std::[io]fstream.
This change removes a significant volume of cruft from llfile.{h,cpp}.

restore the ll[io]fstream because we need them as wrappers on Windows for wide char paths; on other platforms they are now just typedefs to the std classes

To be more accurate, this changeset doesn't actually eliminate the dependency:
it eliminates the use cases for the llifstream / llofstream feature that
requires it.
Currently you can construct an llifstream or llofstream from an open LLFILE*
file handle (or, except on Windows, an int file descriptor). But rather than
containing a streambuf implementation based on FILE*, llfile.h relies on the
fact that the Windows std::filebuf happens to support that as a nonstandard
extension; also on a nonstandard GNU extension __gnu_cxx::stdio_filebuf<char>.
To move from GNU libstdc++ to clang's libc++ (the direction on Mac), we could
code a streambuf that supports FILE*. But before doing that, it's worth asking
whether anyone actually uses this questionable feature.
In fact there were only two methods: LLWearable::exportFile() and importFile()
-- and only one call to either, in LLViewerWearable::saveNewAsset(). The code
in saveNewAsset() opened the LLFILE* immediately before calling exportFile(),
meaning we could reasonably push the open operation down into exportFile().
That logic was complex anyway due to the need for the caller to close the
LLFILE* regardless of the success of the exportFile().
Change LLWearable::exportFile() and importFile() to accept a std::string
filename rather than an open LLFILE*. Change LLViewerWearable::saveNewAsset()
to simply call exportFile(filename) rather than horsing around with an LLFILE*
handle. (This improves the code in another way too: it encapsulates the need
to open the relevant file in binary mode. Previously, each caller had to
remember to do that.)
To prevent inadvertent reintroduction of ll[io]fstream(LLFILE*) code, add
llstream_LLFILE preprocessor macro (default 0) to control access to the
relevant constructors. Also suppress rdbuf() override, the only method whose
signature references llstdio_filebuf.

Update to build on Xcode 6.0: turn BACK ON warnings as errors for overloaded virtuals [-Woverloaded-virtual] and fix up first (of many) files

Fixes for crash reporter startup race condition, crash reporter CPU use, Secondlife.log filehandle, XP Crash.

Integrated Nicky Dasmijn's patch to handle the unicode file paths properly.
Code reviewed, patch was clean.
Tested locally, correctly allows wearables to load where they would fail before.
Should be ready for automated build & QA.

cleaning up build
moved most includes of windows.h to llwin32headers.h to disable min/max macros, etc
streamlined Time class and consolidated functionality in BlockTimer class
llfasttimer is no longer included via llstring.h, so had to add it manually in several places

Partial rewrite of llifstream and llofstream (Windows implementation pending).  Moved more functionality from llviewerwearable to llwearable

Attempting to debug an observed LLFile::remove() failure, I was floored to
find that remove() made no attempt whatsoever to report its lack of success!
Add warnif() function to log errno text in platform-dependent way. Support the
notion that for some functions, certain errno values are acceptable -- e.g. we
expect stat() to frequently hit ENOENT -- and need not be logged.
Add commented-out Windows-specific logic to try to provide further information
in the case of EACCES ("Permission denied," e.g. another process has the file
open). To use, enable the code block, download handle.exe and turn on DEBUG
logging for LLFile. handle.exe can be obtained from:
http://technet.microsoft.com/en-us/sysinternals/bb896655

ER-330 : Improve ObjectUpdateCached message packing.   Added some viewer metrics, will disable later.

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

dataserver-is-deprecated

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

merge -r 87067:87077 svn+ssh://svn.lindenlab.com/svn/linden/branches/maint-render/maint-render-4-merge -> release. dataserver-is-deprecated.

QAR-389

QAR-369

QAR-369 - viewer-cleanup2-7 81916 merged into release.