Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
Since Boost 1.64, you can use the boost_test_print_type
customisation point to provide test printing for types.
Move all test printing functions to this, and scrap the
fiddly Boost version handling to deal with older Boosts
(KiCad is now at minver 1.71).
