No collision on item properties with node-id and rel type.

- Change so database autoset node-id and relationship type
 are referenced as <id> and <type> while user set properties
still are referenced as {propName} for caption in style / grass.
Merge pull request #3679 from oskarhane/2.2-no-collision-item-properties-with-db

Fix collision on item properties and node-id / rel type in GraSS.