forced unit conversion code to inline
unit conversion now no longer converts all the way to base and back, but tries
to find equivalent units as early as possible
fixed another llinfos instance
scene monitor now outputs n/a for invalid samples

removed bad assert
fixed precision issues during int->unsigned int conversions and vice
versa

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

of unit operators

gcc 4.1/4.2 support

continued conversion to units system
made units perform type promotion correctly and preserve type in arithmetic
e.g. can now do LLVector3 in units
added typedefs for remaining common unit types, including implicits

converted many values over to units system in effort to track down
source of 0 ping

fixed bad search and replace

added convenience types for units F32Seconds, etc.

SH-4346 FIX Interesting: some integer Statistics are displayed as floating point after crossing region boundary
fine-tuned heuristics for switching between mean and current values in stat bar display
added comments to LLUnits unit test