Added journalization for document removing and restoring.
Dropped no longer used document state journalization.

The documentish object only provide a second state (`document-state-removed`,
`mail-state-removed`) and the corresponding transitions are handled separately.
Unify and adjust trash journalization messages, for better differentiation.

The differentiation between trashing and removing a document was not visible for a user.
Merge pull request #677 from 4teamwork/pg_remove_journalization

Added journalization for document removing and restoring.