DOC: fix docstring of value_counts/nunique dropna argument after GH7424
BUG: grouped hist and scatter use old figsize default
BUG: single column bar plot is misaligned
BUG: Better xaxis handling for partial layout
DOC: Fix parameter in reindex_axis docstring
SQL: don't reflect full database GH7396
CLN: Fix typo
CLN/DEPR: Fix instances of 'U'/'rU' in open(...)

#7131
BUG: {expanding,rolling}_{cov,corr} don't handle arguments with different index sets properly
ENH: change BlockManager pickle format to work with dup items
Merge pull request #7370 from immerrr/blockmanager-new-pickle-format

ENH: change BlockManager pickle format to work with dup items
Merge pull request #7604 from seth-p/moments_diff_index_sets

BUG: {expanding,rolling}_{cov,corr} don't handle arguments with different index sets properly
Merge pull request #7624 from bwignall/quickfix_depr

CLN: Fix typo
PERF: optimize MultiIndex.from_product for large iterables
Merge pull request #7627 from immerrr/perf-multiindex-fromproduct

PERF: optimize MultiIndex.from_product
BUG: doc example in groupby.rst (GH7559 / GH7628)
Merge pull request #7631 from jreback/groupby_nth_fix

BUG: doc example in groupby.rst (GH7559 / GH7628)
DOC: v0.14.1 edits
FIX: don't create 32 bit int type for int64 column (GH7433)
DOC: small doc build fixes