luatpt_getPartIndex now passes a negative (invalid) index when it fails
Merge pull request #217 from boxmein/getpartindex-fix

luatpt_getPartIndex no longer returns a valid particle index when next_getPartIndex is false.
Tabs to spaces.
Proper command synopsis.
Capitalize Tpt to TPT.
Merge pull request #219 from ryanmjacobs/readme

Update Readme
Fix scons option descriptions - c9df5869d4a2
fix URAN not heating up under pressure at 0K
fix scons --help
New element: GRVT (gravitons), energy particle that creates Newtonian Gravity
Some changes which make GRVT work better
New element: DRAY (Duplicator RAY)

Replicates a line of particles in front of it, affected by tmp and tmp2, and being sparked by PSCN or INWR
make PHOT only able to move 2 pixels at a time through things again
add airblock wall
fix small ClipboardPush error that shouldn't ever happen
fix compiling problems
remove _32BIT also
change .format to support python 2.6
more sconscript fixes
remove -funsafe-loop-optimizations on mac