*  Instead of cp, use *install*.
 *  Store paths in paths.ini.
 *  Allow arbitrary number of path groups (bin, man, share, libexec...).

I have no idea what I was thinking when I added the pipe there...

Although pretty, this way of initializing ffoo must go since it's
not possible to protect it with a working `|| exit 3` clause.

Problem is that bash will create the pipe no matter if the ffoom call
eventually succeeds or not, so in case ffoom is not ready we end up
sourcing and empty file--which always succeeds.

Use this parameter to prepend directory to module search path.

If user wants to interpret the SemVer they can use one of modules
available for this purpose or do their own "cutting".

to easily test out documentation for currently developed library.

which is somehow better than "random" order.

Use of `;&` instead of `|` yields the same behavior, but is much easier
to read if number of alternatives is longer.

 *  Re-use code provided by `-e` as function exit status.

 *  Default to FFOO_EXITS_USAGE, i.e. 2.

 *  Add -k as shorthand for `-e 0`.

 *  Update and enhance docstring.