Make EDTF parser available as undate formatter; handle 5+ digit years

[rlskoeser]

This adds glue between undate and the existing EDTF parsing by adding a date formatter class. The parse method simply uses the parser and transformer; the to string method uses custom logic because I couldn't figure out an elegant way to leverage the parsing code (there's a reconstruct method but the tree is pretty complicated).

I also added support for parsing and formatting 5+ digit years now that we support it (this is based on the numpy code in #84 ).

[rlskoeser]

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[rlskoeser]

Think this will need to be updated with the #84 changes?

It is branched off from that but will probably need to be updated, they may have diverged by now. I'll update this one after the big numpy refactor is finally merged into develop.