Add hover text to table headers

This is an outline of the text to show when hovering over headers in the table.
It was unclear as to what each column meant and this is intended to make that
clearer.
Rename count to Non-Redundant Count

This should help some with what this column means.
Disable range selecting for the heatmap

This option is considered unfriendly to the user. I have added a toggle to
enable or disable it as we will wish to keep the code for other uses. More
advanced users will find it useful but it is not needed here.
Add family number

We should show family number somehow. This is not the best way but it will start
the discussion I hope.
Simplify loading data

This should help with some of the inconsistency bugs that were popping up. I've
removed code related to getting coordinates via a post request and instead stuck
to gets, which is how this data will be loaded. This should remove several
bugs.