Added valid_moves and move() implementations plus debug & test
 On branch master
 Changes to be committed:
	modified:   src/gb.c
	modified:   src/gb.h
 Changes not staged for commit:
	modified:   src/gt.c
	modified:   src/gt.h
	modified:   src/main.c
Imlpemented gt_fill with variable lookahead
 On branch master
 Changes to be committed:

	modified:   src/gt.c
	modified:   src/gt.h
	modified:   src/main.c