Remove LIBFILE global. lib command is no longer around to use it
Merge procss-help with procss-env
Remove doc files; See full commit message

The doc files were getting a little awkward to deal with.
As of this commit, there are unstaged changes to the way
procss handles help topics that will replace the removed
documentation. Don't worry, everything works fine,
and it does not matter that these files were removed
before the other commit was made. In fact, ProCSS
is being reorganized, and doing this first makes
things easier to digest in the long run.

The longer documentation files have been pulled out
to be converted to Markdown. It's time to start
working on the Wiki.
Improve readme with plain language and a mention of the wiki
Recorganize commands, improve error handling and refactor help

procss-env got really big and annoying, so now it routes commands
to files in the commands/ folder. procss-common was created to hold
common functions and environment variables used by commands.

__procss_err() is now used to report all errors. Some additional
functions were defined for reusable tests:

1. __procss_is_path
2. __procss_is_scout
3. __procss_route_basename (renamed from "__last_in_route")

commands/help now contains all command line documentation in a
similar format that procss-env used to be.

Error handling has been improved and there are now more checks
to protect against bas usage of the procss tool.

I may want to start worrying about automated testing soon because
I do not know all possible states of the commands.