Add a few sample epigrams and the fortunes package.

Add a few sample epigrams and the fortunes package.

This adds a single file containing ~200 tagged epigrams in English
language. The debian/control file is extended to provide the new
"tfortunes" package which ships this data file. The new package is
Recommended: by the tfortune package but tfortune works without it
if epigrams are provided locally.

The debian/copyright file also needs to be adjusted because the
epigrams are under the public domain while the source code remains
GPLv3.

The epigrams were created by running

	tfortune -- print -atx pub

on the author's epigram database with "pub" being a tag expression
that filters out epigrams not suitable for public exposure.

Suggested-by: Adam Borowski <kilobyte@angband.pl>
v2 -> v3
~~~~~~~~
Apply fixes provided by Adam Borowski:
 * Fix bogus date in debian/changelog (s/Mon/Tue)
 * Make the data package Arch:all, since it is truly arch-independent
 * Add Multi-Arch header to debian/control

v1 -> v2
~~~~~~~~
Incorporate feedback from Adam Borowski:
 * Fix typo in description of the tfortunes package
 * Update debian/changelog and increase debian version number