Resolved CAY-1812 - Add Next/Previous Buttons to DbRelationship/ObjRelationship Inspectors

[laakhbeenor]

Proper buttons were added in Inspectors, and other buttons near them changed their names and function a bit to make this dialog comfortable to use. Done button was changed into Save button, which only applies changes, but doesn't close the dialog. Cancel button was changed to Close button, which does the same thing, but the meaning of using it is a little diffrent.

[asfbot]

Cayenne pull requests #74 FAILURE Looks like there's a problem with this pull request