Great rewrite with revamped CLI, many added features and bugfixes.
* New CLI optimized for simple use. Default action is to show
module doc in manpage viewer.
* Respects variable documentation.
* Respects module documentation (first stray docstring).
* Can export (ugly but usable) module docs as Markdown, POD or
manpage.
* Dropped useless features as --cat (one can always open the file)
or display of partial documentation.
* Provided more rich usage hint.
* Rewrote tests with focus on more probable scenarios.
Alois Mahdal