fixed business day calculation
Merge pull request #5227 from jreback/enlarge_empty

BUG: allow enlargement to work with empty objects (GH5226)
Merge branch 'bdays_fix' of https://github.com/wuan/pandas into wuan-bdays_fix
Add a convenience function to compile pandas ready for doc-building
Add some new entries to API doc
Merge pull request #5124 from JanSchulz/API_additions

Add indexer and str to API documentation
BUG/CLN: MI now checks level & label compatibility

Via verify_integrity kwarg. Internals all pass False.

CLN: Verify integrity by default on label/level setting
Merge pull request #5214 from jtratner/mi-validate-level-label-compat

BUG/CLN: MI now checks level & label compatibility
Fixed assertion error message
DOC: fix building of gbq docs
Merge pull request #5242 from ojh/master

Fixed assertion error message
Merge pull request #5241 from jorisvandenbossche/docs-gbq-fixes2

DOC: fix building of gbq docs
API: default export for to_clipboard is now csv (GH3368)