Plot data calculations could be tidied up in views.py

[David Platten]

At the moment there are two CT and DX list filters. One is for the usual view, and the other is for when a user has clicked on a link in a histogram plot. It should be straightforward to just use a single list filter for each of these modalities.

[David Platten]

Removed ct_histogram_list_view and dx_histogram_list_view in views.py. Removed use of /hist/ url in plots and urls.py. Moved chart plotting calculations for dx and ct into their own method in views.py. References issue #237.

→ <<cset 7b65a772b018>>

[David Platten]

Only one routine for CT and DX in views.py now.