[*] annihilate legacy code
[main] extinguish references to legacy code + bump version and dates
[tool] exterminate references to legacy code
[tool] destroy --alias option and legacy mkluatexfontdb emulation
[doc] silence claims about the existence of mkluatexfontdb#
[doc] update NEWS
[*] bump version
[*] remove tests directory

Testing has been done using the test repo exclusively for quite some
time now: https://bitbucket.org/phg/lua-la-tex-tests. Also, the
``mktests`` script partially automates testing of the font management.

This changeset is just codifying the facts.
If any of the tests deserves preservation please file an issue for
inclusion into the test repo.
Thanks!
[*] excise test-related make rules
[doc] update news