BUG: Fixed a bug in convert_objects for > 2 ndims GH4937
Merge pull request #4938 from jreback/panel_convert

BUG: Fixed a bug in convert_objects for > 2 ndims GH4937
ENH: Add 'is_' method to Index for identity checks

Adds a method that can quickly tell whether something is a view or not
(in the way that actually matters).

CLN: change 'is' check to 'is_' check in 'equals()'