Adds a new `_print` function to print strings without coloring or
other stuff added by the `_msg` function. It's used for the usage
message, letting it be translated.
The usage messages have been split into one-line strings, and added
back to the tomb.pot and *.po files.
Issues:
`gettext -s - "$2"` prints the -, instead of getting the desired effect
The custom expansion missed repeated variables in a single string
Some string fixes
This commit re-organizes all the source distribution contents to
present users with the simple script, while moving the rest in extras.
Also autoconf/automake scripts were removed, back to minimalism.
The rationale of this change is that Tomb really only consists of a
script and users with no extra needs should just be presented with
it with no need for anything else. Any other thing on top of the Tomb
script is an extra and can be even distributed separately or integrated
in distributions.
