Initial commit.

Initial commit.

Tfortune was maintained in a non-public git repository between 2016-04
and 2018-01. By then it was moved to a dedicated repository, rewritten
to support the tag expression grammar and made scalable by introducing
linear hashing. At the same time command line parsing was switched
to the lopsub library, the command line options were redesigned and
properly documented, and the nifty logo was added.

In 2018-03 tfortune reached version 1.0 and was finally made public. All
commits that led to version 1.0 have been discarded, so this repository
contains only the final result as a single commit.

Many thanks to Effie Symeonidi who gave valuable feedback regarding the
installation instructions.