BUG: Fixed a bug with setting invalid or out-of-range values in indexing
     enlargement scenarios (GH4940)
Merge pull request #4943 from jreback/e_dtype

BUG: Fixed a bug with setting invalid or out-of-range values in indexing enlargement scenarios (GH4940)
CLN: removed Panel.fillna, replacing within core/generic.py/fillna
Merge pull request #4951 from jreback/fillna

CLN: removed Panel.fillna, replacing within core/generic.py/fillna
CLN/ENH: add parse_dates arg and use TextReader
ENH: add tupleize_cols arg
CLN: default tupleize_cols=False for back compat
TST: make tests pass
DOC: read_html doc overhaul