Show workflow info when no module is selected

Also renamed:
"Properties" -> "Workflow Info"
"Module Information" -> "Module Info"

gui/module_info.py:
  Set title to "Module Info"
 - update_module:
   Show workflow info when no module is selected, both are docked, and
   one of them is visible.

gui/version_prop.py:
  Set title to "Workflow Info"

fixes #15
Fixes three (3!) NameErrors in tabledata