Orphaned paragraphs cause problems for the usage counter

Problem/Motivation

If there are orphaned paragraphs with usages then it will always looks as though the link remover has something to do.

Steps to reproduce

Proposed resolution

Not sure yet - either:

• update the orphaned paragraphs - just save a new revision of the paragraph
• somehow don't count them - use the purger's isUsed() method somehow
• somehow remove them - use the purger

Remaining tasks

User interface changes

API changes

Data model changes