As it's in git.

On NixOS, /usr/bin/awk doesn't exist.

 * using the new `make check` target various bugs have been discovered.
   All of them were related to missing database fields.

 * keep the openrussian-sql.zip to avoid bitrot (sudden breakage when building the
   project against a recent DB)
 * allow lookups against inflections.
   A special table `bare_inflections` was added to the DB in order to speed this up.
 * authentic autocompletions taking every parameter into account, using a magic `-C` parameter
 * language selection via locale or -L<lang>
 * translation lookup
 * allow multiple search terms on the command line without escaping
 * all SQL strings are properly escaped now to avoid (accidental) code insertion
 * luautf8 is mandatory now and used much more, which is safer
   than handling Unicode strings with the builtin functions
 * ignore "disable" database entries
 * added option -V (verbatim)
 * more protections against empty fields
 * print "DERIVED FROM", "AUDIO", "USAGE" and various word relation sections
 * print word ranking and level (A1-C2...)

 * this allows precompiling openrussian.lua,
   automatically downloads, converts and VACUUMs the openrussian
   database and provides an `install` target
 * Bash completions allow completing "bare" Russian words for the
   time being.
   Unfortunately we cannot complete with accents, since Bash completions
   do not allow to change the already typed word (apparently) and users
   aren't going to type in accents.