Added documentation.
Modified parsing.
Added 'quiet' option.
	modified:   parser.c
	modified:   parser.h
	modified:   turing_machine.c
	modified:   turing_machine.h
	modified:   utm.c
Added user feedback when the TM calculates a decision (yes or no)
	modified:   turing_machine.c
	modified:   turing_machine.h
	modified:   utm.c