Database corruption resistance. Added Validators. Added restore from argv with better bash_completion.

Ignores line if line not parsable in todo.

Updated Man.

Updated bash_completion

Added validator function

Added todo <number> list.
	I always forget what number I was supposed to look at when I use
	todo.

Added argv parsing for restore database.
why write to the same file again.?
when you just read from the that File..