added a known issue about quantity and np.isclose
converted the formula to math mode
made a and b mathmode
changed all ipython prompts to normal >>> for consistency
made the latex nicer and redid the a and b to be normal verbatim text
Merge pull request #3016 from wkerzendorf/docs/npisclose_quantity

added a `known issue` to the docs about quantity and np.isclose
Set column slices using an ndarray view of the underlying data
Update CHANGES.rst
Merge pull request #3020 from taldcroft/table-set-slice

Set column slices using an ndarray view of the underlying data
Merge branch 'master' into table-no-array [skip ci]