BUG: DatetimeIndex.insert doesnt preserve name and tz
Merge pull request #7386 from sinhrks/insert_fix

BUG: Revisit DatetimeIndex.insert doesnt preserve name and tz
make nanops._maybe_null_out work with complex numbers ( issue #7353 )
make nanops work when ndim==1 and axis==0 ( issue #7354 )
support axis=None for nanmedian ( issue #7352 )