Update man page with better markup and new changes

__long_help():
  Rewritten to be more 'standard', using better, more consistent
  markup.

  Reflected the change in naming and logic during artwork extraction.

Renamed 'backup' to 'increment', when testing for clobbering, since
we're not actually backing up (or rotating) files/directories, but
creating files/directories with an incremented integer.

Updated version to 0.30_pre, to help show the massive changes since
version 0.22{,pre}.

Minor tweaks/comments