A more dynamic front page

One of the more interesting comments from our review was a wish to have a different view on the main page. Rather than seeing say the first dozen of the global lists of source files, modules, etc. which are often just a tiny fraction of the project, the suggestion was instead that the main first column be "Modules" (unavoidably long). But that the "Procedures" and "Derived Types" columns would be dynamically generated as you select an item in the "Modules" column. I.e., the "Procedures" and "Derived Types" would only display the names of the procedures and types defined in the selected module. Not only do we believe that this would simplify navigation in very large projects, it also helps to avoid ambiguity when the same procedure name is used in multiple modules. E.g., "get()" and other accessors tend to get reused a lot making it hard to select them from a global list.

Related to this is the desire to have the option to suppress the "Source Files" column entirely. This aspect is presumably a relatively trivial change.