Help and usage messages Specify that the help option causes the program to exit immediately. Standardize order of options then positional arguments.
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