break up code from cli.py (now in jrnl.py) up into smaller functions
get rid of export mode
move --encrypt and --decrypt to commands.py
clean up the help screen even more
update flag name for import
Also, cleaned up the way the arg parser handles standalone commands.
Rather than checking individually for each command, you can now register
the command in the proper place, and it will be run with all known
arguments (and cofig if available).
