destroy some rocks with bang dots
renamed config.h -> vorconfig.h and Makefile -> Makefile.in
fixed x coordinate range for new_rocks()
surf_screen and t_frame are globals; stopped passing them as arguments.
started factoring out global t_frame
finish moving data files around (I think)
made bang dots hit rocks, removed blast_rocks function.
easy mode; messages at game over.
removed new ship fade, blast leaves rocks collidable, some refactoring.
fade new ships in, add complaints from HappyPenguin to todo, some refactoring.
sprites now have a flag field (MOVE/DRAW/COLLIDE). rocks which have been blasted do not collide.
renamed *_SPRITE to *, made rocks bounce off each other.
moved grid stuff from rocks.c to sprite.c
* rocks.c (struct rock): changed generic ones to Sprite.
ditched the separate shape struct.
Updated collide to take two sprites. removed references to stdint.h (using inttypes.h where necessary). Makefile: update header dependencies.
renamed shape files to sprite, added todo list to svn.
refactoring towards sprites, updated todo
* rocks.c (hit_rock, pixel_hit_rock): fix more possible bugs.
* rocks.c (hit_rocks): oops, had r(ight) where I should have had t(op). (pixel_hit_rocks): added bucket validity checks.