COMPAT: comparisons master issue
master issue for some comparisons
- [x] #13128, datetime with string on frame
- [x] #7830, datetimeindex vs other
- [x] #8932, timestamps with frame
- [x] #12601, tz comparisons
- [x] #9369, numeric and Series
- [ ] #11565, strings and numbers
- [x] #13200 Period and Series/Index
