fix for crash on exit resulting from 8c0e024d0c33

changed culling to use inverse distance to calculate solid angle, not distance squared

updates appearance utility dependency

added flag to LLInstanceTracker to allow multiple values per key
made StatType allow multiple values per key to eliminate block timer related crash

removed complicated and unnecessary fast timer gapless handoff logic (it should be gapless anyway)
improved MemTrackable API, better separation of shadow and footprint
added memory usage stats to floater_stats.xml

renamed "current" to "primary" when referring to accumulators

another attempt to move mem stat into base class

made getPrimaryAccumulator return a reference since it was an
always non-null pointer
changed unit conversion to perform lazy division in order to avoid truncation
of timer values

replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

various fixes to lltrace
start() on started recording no longer resets
fixed various instances of unit forgetfullness in lltrace
recording split now has gapless timing
scene monitor now guarantees min sample time
renamed a bunch of stats
added names to debug thread view on windows

also, removed LLTrace::init and cleanup
removed derived class implementation of memory stat for LLMemTrackable
is automatic now

removed LLThreadLocalSingleton
collapsed all thread recorder classes to single type, LLTrace::ThreadRecorder
moved fasttimer stack head to llthreadlocalsingletonpointer via ThreadRecorder

added ability to force uniqueness of LLCopyOnWritePointer
converted more variables to units
added convenience function for unit constants

fixed some lltrace logic errors
more consistent syncing of timestamps of sample values in recording stack
selection of primary buffers was completely incorrect
assignment of recordings got wrong play state due to implicit
operator = defined in base class
fixed asset stats only working up to the first send

pulled swap() out of ui time block
cleaned up internal lltrace dependencies, factored out common accumulator definitions

removed implicit flushes on reads from recorders for better performance
made sure stack timers were updated on recorder deactivate
faster rendering and better ui for fast timer view

removed unnecessary templates from accumulator types...now always
track data in double precision floating point, using templated accessors to
convert to and from arbitrary types

fixed multithreading lltrace causing values to be interpolated towards 0
added Radians unit
improved sceneloadmonitor restart heuristic to use accumulated camera motion

reverted SlaveThreadRecorder update gating
moved processTimes() outside of Recording, so it is called only once per frame
refined sample merge logic so that multi-threaded samples do not stomp on linear history
of a stat

fixed LLTrace::ExtendablePeriodicRecording::extend() to include *all* frame extensions
gated SlaveThreadRecorder pushing to master based on master update rate
reverted changes to LLThreadLocalSingletonPointer to not use offset-from-default trick

fixed copy construction behavior of Recordings to not zero out data
split measurement into event and sample, with sample representing
a continuous function

removed extra dereference for copy on write pointer
moved copyonwrite mechanism to RecordingBuffers from individual buffer
fixed logic that was leaving scene unfrozen when camera moved during metrics gathering

fixed memory leak
fixed glitching of fast timer display

fixed crash on startup

fixed some uninitialized variables
root timer accumulator was being initialized to NULL

improved performance of fast timer stat gathering (fixed typo)

improved performance of fast timer stat gathering

fix for unit test failures...cleanup apr without destroying
pools, allowing LLProxy to clean itself up as a singleton (and
avoiding spurious dependencies associated with manually destorying
singletons that rely on apr pools)

made fast timer stack thread local
added LLThreadLocalSingleton
made LLThreadLocalPointer obey pointer rules for const
added LLThreadLocalSingletonPointer for fast thread local pointers

improvements on lifetime of lltrace core data structures
tweaks to thread local pointer handling so that static constructors/destructors
can safely call functions that use lltrace

removed some potential data races
got memory stats recording in trace system