The upstream source release tarballs do not include a rockspec (or
licensce or other goodies) and hence the atempts to manually install the
bits ends up with no metadata to build manifest from. This means
`luarocks list` will not find this even though it is installed. Since
upstream actually recommends luarocks as the "easy way" anyway, lets
just do that...

When looking into using luajit as opposed to lua51 for lpeg (for Neovim which
already pulls in luajit), daurnimator pointed out that "lua libraries can be
used with many games/applications/etc that all embed lua either statically or
in some vendored way," and as such should not depend on Lua themselves.

Rebuilding the package to fix 'db-update' glitch that dit allow me to update the database.