Issue867docsForPlotlyCharts

Written initial Plotly chart doc skeleton [skip ci]. Refs issue #867

Updating doc to address very wide tables [skip ci]. Refs issue #867

Testing to see if embedding an example Plotly chart in the docs works. Refs issue #867

Added method to save Plotly charts as an HTML DIV in the MEDIA_ROOT folder. I need this to be able to produce charts for the documentation. It is deactivated for all users, and can only be activated by modifying the source code. Also renamed file_name to filename in some chart code for consistency. Refs issue #867

Added new settings variable to control the creation of the Plotly html chart files. Refs issue #867

Added some example charts to the docs. Added line of code to remove any trailing whitespace at the end of name values in the chart code. Refs issue #867

Added remaining chart examples to the docs. Fixed typo in binned statistic file name - it was the same as the mammo scatter plot. Refs issue #867

Added stylesheet to try and force max width of doc pages to be larger. Following the suggestion here: https://stackoverflow.com/questions/23211695/modifying-content-width-of-the-sphinx-theme-read-the-docs [skip ci]. Refs issue #867

Added more to the chart docs. Re-ordered chart option entries for consistency. Refs issue #867

Added the remaining colourmap swatches. Refs issue #867

Added some themed charts [skip ci]. Refs issue #867

Added user profile option to remove trailing whitespace from category names. Refs issue #867 and issue #477

Updated changes file [skip ci]. Refs issue #867

Added option to remove multiple whitespace from chart category names. Refs issue #881 and issue #867

Changing width of doc page to 1000px from full width. Will still be wider than the default 800px. Refs issue #867

Adding some description to the workload chart. Ed - does this clarify things for you? [skip ci]. Refs issue #867