TEIIDDES-2352: Save the jdbc password token to xml

* The jdbc password token is not being saved to the xml file hence the
  password is not found and reverting to the default upon reloading

* Completes the cycle by saving the jdbc password token in the same manner
  as the admin password
TEIIDDES-2368
* added combo box listener to properly set Update Count value on procedure ref
* added description == null check to prevent removing the description when all tags are removed
* cleaned up RelationalModelFactory by removing secondary adds to model contents.