SV_PointContents removed (all calls replaced with Mod_PointInLeaf, which is faster)

SV_PointContents removed (all calls replaced with Mod_PointInLeaf, which is faster)
SV_HullPointContents removed (no longer needed)
SV_TestEntityPosition now returns an int (true if in solid) rather than an edict_t *
sv_jumpstep added - step up while airborn, for example when jumping
sv_wallfriction added - to allow it to be turned off if desired
fly and noclip movement for players is now more like swimming

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@1933 d7cf8633-e32d-0410-b094-e92efae38249