Log message:
Add a package for hfstospell-0.5.1.

This is a library that's part of providing a fully featured spellchecker
for Finnish. From DESCR:

This is a minimal hfst optimized lookup format based spell checker library and
a demonstrational implementation of command line based spell checker. The
library is licenced under Apache licence version 2, other licences can be
obtained from University of Helsinki.