Add an patrols summary table to the patrols workflow

[walljcg]

We should include a table summarizing patrols with the following columns:

serial number
patrol type
patrol title
start
end
distance
tracked_by

** columns could be controlled by a config parameter when generating the table

The table should be scrollable and allow sorting on the different columns. Ideally, a 'download' button would let the user export a csv.

A quick-win is to start with the pandas.DataFrame.to_html() function. But eventually we probably need our own 'EcoTable' class to meet all these needs.