Show module groups that are completely within project type

Module group may contain modules that belong to different project types.
Show only those that belong to selected project type completely. Otherwise
user may wonder why the same module group shows different results
depending on selected project type - that may be misleading.

Also added 'unknown' module into project type 'all'. That module
holds all emails that were not assigned to any of known modules

Change-Id: Ie0f54802463d67ba9de7ddb76f58314b05e58e19