- textual rendering of patch-module (with absolute paths)
- explanation label in the Show JPMS Options dialog
- dis/enablement for the new button
- text polish
- robustness wrt closed projects
- offer to add system modules needed for add-reads
- offer tab switching from add-reads and remove(module)
- split module search (for correctness & speed):
  - system modules only via the projects JRE entry
  - only non-system modules via workspace search
- when current project is a patch, show the patched module as focus mod
  - required: improved CPListElement.{hashCode,equals}
- polish null return vs. exception
- create module attribute on source folder of focus project if needed

Change-Id: I379ecdee3b3116820af5fc15fae6873542723852
Signed-off-by: Stephan Herrmann <stephan.herrmann@berlin.de>