DOC: Issue #6763 - Corrected MERGE example
Merge pull request #6776 from SplashDance/master

DOC: Issue #6763 - Corrected MERGE example
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BUG: Bug in setting a tz-aware index directly via .index (GH6785)
Merge pull request #6786 from jreback/set_index

BUG: Bug in setting a tz-aware index directly via .index (GH6785)
BUG: bug in taking all on a multi-index when only level 0 is specified (GH6788)
TST: simply some yahoo network tests
Merge pull request #6790 from jreback/slice

BUG: bug in taking all on a multi-index when only level 0 is specified (GH6788)
ENH: Extends the number of Periods supported by allowing for Python defined Periods. Periods now hold reference to Offset rather than just freqstr (GH5148).
api change