Archers now get access to both Poisons and Traps trees
Poisons now work on both arrows and shots

Irresistible Sun got distotion effects

New fireflash and flame effects
New Gravity Well effect

Particle systems can check availability of shaders
Particle systems can now also the background that is under them, allowing things like distortion effects
New distortion effect for the Repulsion Blast and Gravity Spike

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Most of the PHYSFS_* functions behave like their fopen/fclose/etc counterparts,
returning 0 on success and nonzero on failure. PHYSFS_close is a special
snowflake and returns zero on failure.

This fixes this behavior so that functions expecting PHYSFS_close to behave
like fclose don't freak out.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

This was causing savegame zip files to be "invalid" according to everything but ToME.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

This fixes the 'bad neunon bad' commit (14f562a9). Bad DarkGod, bad, I guess?

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Through the Crowd now also makes you like being in the crowd, +10 all saves for each friendlies in sight