DOC: doc fixups for (GH7213)
CLN: cleanup related to (GH7206) don't create the disabled properties at all for Series
Merge pull request #7216 from jreback/ops2

DOC/CLN for GH7213/GH7206
BUG: bug in setitem with multi-index and a 0-dim ndarray (GH7218)
Merge pull request #7219 from jreback/si

BUG: bug in setitem with multi-index and a 0-dim ndarray (GH7218)
TST: tests for reindex_like consistency (GH7179)
Merge pull request #7221 from jreback/reindex_like

TST: tests for reindex_like consistency (GH7179)
add tests for nanops
implement additional tests for groupby apply methods
simplify groupby's std method
add sem to nanops
add sem to aggregate methods
add sem to groupby
add sem to docs
nantest reorg 1