Help and usage messages
Specify that the help option causes the program to exit immediately.
Standardize order of options then positional arguments.
Rewrote debom to mirror the new rebom
debom had many options, which were never useful. Output redirection
should simply be handled by the script that calls debom.
Formatting fixes; Help message fixes
Refactored code into multiple 'packages'. One day these may be
independently installable. For now it's just an organization method.
Rewrote main README and added per-package READMEs.
Also: bug fix on whiched and whichvi. They formerly propogated an error
if $EDITOR or $VISUAL were set to a non-existant executable. Also
improved the inline documentation.
Initial commit of cleaned-up dev branch