DOC: Remove iloc example.
Merge pull request #5296 from TomAugspurger/iloc-docs

DOC: Remove iloc example.
Merge pull request #5004 from cancan101/retail

ENH: Support for "52–53-week fiscal year" / "4–4–5 calendar" and LastWeekOfMonth DateOffset
- Cleaned up ambiguous _offset_map
- Add test showing issue with period index construction
CP
CP
fix compat issue
CDate might not be defined
remove some circularity
Further simplify
Another example of PeriodIndex issues
- Fixed issues from rebase