changed unit declarations macros to make a lot more sense

manipulation of callsite strings in llerror

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

added unit tests for lltrace

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