Make current_metaclass() private

It's not documented and is only called internally and in tests
Make headers go from 1 to 2, not 1 to 3
Fix typo in docs
remove unneeded use of FindBin
basic dzilification
clean up entries in Changes file
add contributors to metadata
make eol tests pass
add a t/zzz-check-breaks.t test
ensure namespaces are clean
weave pod
make pod coverage test pass
make pod spelling tests pass