Documentation about catnip

[gredmond-mo]

I have updated the current sphinx documentation to include the new functions as well as example plots for those functions that output one. See https://www-hc/~gredmond/sphinx_ciid_tools/_build/html/tools.html

The downside is I had to make some changes to the fcm ciid_tools repo to do this, there was one minor mistake that I missed when reviewing, and I had to make small changes to the doc string formatting to comply with sphinx.

[nhsavage]

still to do:

1. add sample data
2. update docstrings to refer to new sample data location

[balazagi]

still to do:

1. add sample data
2. update docstrings to refer to new sample data location

I think this has now been address by b97fb3a and can be closed

[balazagi]

closed as it has been addressed