PEP 8 iris.pandas
PEP 8 iris.palette
Merge pull request #627 from rhattersley/pep8-palette-and-pandas

PEP 8 iris.palette and iris.pandas
PEP 8 iris.exceptions
Merge pull request #628 from rhattersley/pep8-iris.exceptions

PEP 8 iris.exceptions
NF - add 1D scatter plot functions.