Modules should optionally be uninstalled entirely

In order to keep clean and manageable data for the system
as a System Admin
(sometimes) I want to remove all of the irrelevant files/data when a module is uninstalled.

Acceptance criteria:

1. When a module is being uninstalled you should be able to choose if you want to keep or remove its data.
   • Provide a dialog: "Do you want to remove all data created by the module? Yes/No".
   • If user chooses 'Yes', remove the following data: module classes and files contained in an omod (already implemented), tables, global properties and custom files created by the module.
   • If user chooses 'No', only module classes and files contained in an omod should be removed (already implemented).
2. When a module is being upgraded none of data mentioned above should be removed.
3. When a module is being downgraded you should be able to choose if you want to keep or remove its data.
   • Provide a dialog: "Do you want to remove all data created by the module? Yes/No (the operation may fail)".
   • If user chooses 'Yes', remove all the data mentioned above.
   • If user chooses 'No', only module classes and files contained in an omod will be removed but the operation may fail. So provide a warning such as - "All data created by the module will be kept, but the operation may fail."

Chosen solution:

1. Notify a module that it is being uninstalled. The module should be able to list tables, global properties and files to delete. The actual deletion should be done by the core.
   • If this is a module downgrade, the method should be given the version being uninstalled and the lower version being installed.

See these files: moduleList.jsp, ModuleListController, ModuleFactory

I suggest this be a class that has methods to get the table names to remove, files to delete, GPs to delete, etc.