COMPAT: change pytables to use 3.0.0 API (GH7990)
Merge pull request #7994 from jreback/pytables_api

COMPAT: change pytables to use 3.0.0 API (GH7990)
CLN: change requirements to only use numpy>=17
Merge pull request #7954 from cpcloud/drop-np16

CI: Drop numpy 1.6 support
ENH: Add duplicated/drop_duplicates to Index