Log Message:
update to 5.10
changes:
-bugfixes
-Ported to MacOS 10.6, including various 64-bit fixes
-Merged juggle and juggler3d hacks
-New hack, surfaces, incorporating objects from old klein hack, plus
 new ones
-New hack, rubikblocks
-Retired hypercube and hyperball, which are redundant with polytopes
-updates to various hacks