Remove tests that formerly mattered for Ops.equal Ops.not_equal

those were replaced with == and != and the tests became tautologies
a helper to convert tests to specs

from
https://github.com/mvidner/ruby-dbus/blob/ca1d8a8bbf98bf775d785249ceecf2b603604c30/test/migrate
converted ui_shortcuts
converted convert_test
more generic _not, arbitrary spacing rules
converted term_test
another variant of spacing
converted exportable
converted path_test
converted ops_test
another spacing heuristic
converted builtins_test
removed remains of test/unit
removed the migration script
version and changelog
warn readers not to learn rspec from this
Merge pull request #113 from yast/test-to-rspec

Test to rspec!