BUG: possible fsync error when filno is negative (GH5999)
Merge pull request #6004 from jreback/pytables_fsync

BUG: possible fsync error when filno is negative (GH5999)
TST: pytables test changes to work in 3.1rc1
Merge pull request #6005 from jreback/pytables_3.1

TST: pytables test changes to work in 3.1rc1
DOC: Clarified documentation for MultiIndexes

Add examples and rewrite an awkwardly-written bit

Cross-reference MultiIndex constructors
Merge pull request #5964 from felixlawrence/improve-multiindex-docs

DOC: Clarified documentation for MultiIndexes
API: Add equals method to NDFrames. (Implemented with `array_equivalent`, which
    is similar to `np.array_equal` except that it handles object arrays and
    treats NaNs in corresponding locations as equal.