0	No errors
1	Error during config file parsing
2	Error during memory allocation
3	Could not open file
4	Error reading file
5	User prompted and choose to exit rather than add a tag
6	Error during move_file
7	idx file eof (shouldn't happen)
8	Tagline file has changed
9	Too much recursion

42	You have managed to break the program and cause it to do summat
	really, really stupid. Congratulations.