Fix bug where use of .ix[tuple(...)]=x fails to correctly check out of bounds index for columns. This is a regression as it used to work in pandas 0.12.0. The code incorrectly checks the column index against the len() of the dataframe to see if it is in bounds not against the number of columns. Have added 2 tests with non-square dataframes to test that the fix works.
BUG when assigning to .ix[tuple(...)
Merge pull request #5896 from ahlmss/AHLRAP-3152

Fix bug where use of .ix[tuple(...)]=x fails to correctly check out of b...