Remove Impostor checkbox.
That control is now merged into the right side of the impostors slider.
Maximum ARC still depends on impostors being enabled.  Once that dependency is removed
in llvoavatar then it will be necessary to reflect that change in the UI code.

Slightly adjust the names of the help text in the three new floaters.

A skip() stating that we don't yet understand why the test fails is implicitly
an open action item. This one isn't open. Save future developers the research.

I don't know at what point the skip() was introduced, but that test now passes
even on Windows.

LLLoginInstance has a test hook setNotificationsInterface(), used by
lllogininstance_test.cpp to redirect notifications through a dummy
LLNotificationsInterface implementation. Certain of LLLoginInstance's
MandatoryUpdateMachine state classes need to post notifications too; but until
now they directly called LLNotificationsUtil::add(). In the production viewer,
this should (!) be the same as calling through LLLoginInstance::mNotifications
-- but it broke two of the LLLoginInstance unit tests, so they were skipped.
Since MandatoryUpdateMachine's constructor is already passed the invoking
LLLoginInstance&, make it store the reference. Add MandatoryUpdateMachine::
getNotificationsInterface(), which forwards to new LLLoginInstance::
getNotificationsInterface(). Change LLNotificationsUtil::add() calls in
MandatoryUpdateMachine state classes to call through mMachine's
getNotificationInterface() instead.
This allows us to remove #include "llnotificationsutil.h" from
lllogininstance.cpp, also that #include plus stub LLNotificationsUtil::add()
implementation from lllogininstance_test.cpp.
Finally, it allows us to remove the skip() calls from the two unit tests.

Until we can propagate the corresponding buildscripts changes, we must
explicitly put AUTOBUILD in proper form. For now, assume that AUTOBUILD has
not yet been normalized.

A particular LLInitParam::TypeValuesHelper specialization is derived from a
different TypeValuesHelper specialization. The subclass constructor
TypeValuesHelper(...) has previously forwarded the call to its base-class
constructor with:
TypeValuesHelper(val): TypeValuesHelper(val) {}
This is the first time I've looked at that; I'm a bit surprised that previous
compilers blithely accept it, and apparently understand the intent. gcc 4.7
complains that we would need to turn on -std=c++11 to support delegating
constructors; obviously the second TypeValuesHelper is now assumed to be the
class being defined, rather than its base class.
Fortunately the class already has typedefs for both specializations, fully
qualified with all template parameters, so I simply replaced the second
TypeValuesHelper reference with base_t.

The former is the real .so, to which libalut.so is only a symlink. We were
packaging the symlink without including its target.
(This appears to have changed since our last Vivox drop for Linux.)

into eventual viewer package -- instead of finding them in the viewer build
tree. Also update Windows to current slplugins package build.

The .dylib files in the Linux Vivox package were erroneous to start with;
while the affected changeset bypassed copy errors, it too was wrong. Now that
the Linux Vivox package contains Linux .so files, revert to the correct
filenames to copy.

Code cleanup, some per bitbucket comments.

since we're not building them as part of the viewer build any more.

Use the same signatures as for the other platforms.

For some reason, after the upgrade to Boost 1.57, gcc 4.6.3 has trouble with
the boost::lambda::_1 usage in stringize.h. This is consistent with other
cases we've encountered in which Boost.Lambda appears to be unmaintained and
losing its compatibility with other libraries. Fortunately Phoenix provides a
functional equivalent, albeit spelled differently.