Report: more info in Value section

[SimonDedman]

Currently:

Line, dot and bar plots, a report of all variables used, statistics for tests, variable interactions, predictors used and dropped, etc. If selected generates predicted abundance maps, and Unrepresentativeness surface

Add more info about each filename and what it is, what the x & y axis and their sizes are, what the report is and how it's laid out and what each thing means.