Allow users to deselect algorithm categories they are not interested in

[NickDraper]

This will need to be another option on the Preferences window to list all the categories with a mechanish to remove those that are not interesting (checkboxes?).

The users selections should be stored in the user.properties file.

At the moment the only way to get a list of categories is to ask every algorithm, a method should be added to the Algorithm Factory or Manager to provide this list.

[NickDraper]

This issue was originally trac ticket 2128