REF: combine all alignment into _align_method_FRAME
This puts us within striking distance of de-duplicating _flex_comp_method_FRAME and _comp_method_FRAME, with _arith_method_FRAME not far behind
Hello @jbrockmendel! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:









There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-01-24 19:59:03 UTC thanks