REF: simplify groupby.ops
Inching towards refactoring out special-cased EA methods into EA/EADtype methods.

I expect this to need some troubleshooting on the 32bit linux build.
hmm lots of checks were skipped hmmph 32bit build is still a PITA.  will troubleshoot a bit more and scale back the offending part of necessary.  related #46197 should be OK in the interim looks like the 32bit is segfaulting and that is somehow screwing up the other builds? punted on the 32bit thing; greenish