re-implemented . using polymorphic()
moved tests for "+" to their polymorphic variants
implemented \ and /
implemented < (mostly)

except for <.f which is hard to test
implemented > (mostly)
implemented & and |
implemented , and ,,
implemented => >> and <<
moved implementation of . before =>

trying to follow the spec's order of functions
impl'd = and moved eq() to top after other helpers
added dummy impls and TODOs for missing functions
implemented <> <= and >=
implemented ~ except for ~.q