Create toplevel and dependent actions so loaded view can display the two tables with sorting/pagination/filtering

Modify available action and view so can share code with toplevel and dependent
Loaded action is still present for backward compatibility despite view ignoring the output

Add server-side sorting, filtering, and pagination for available, making use of tablesorter in the HTML view

Use mymodule parameter for module definition.
This was also helpful in revealing places where the code relied on the global environment.

Changed apk-controller.lua to use new handle_form() functions found in acf_www-controller.lua instead of the controllerfunctions.lua version and also instead of redirect_to_referrer(). Made corresponding changes to apk-model.lua to make everything work.