Orphan marker

Finished proposals should not be deleted, but marked as orphan. This marker should have the following content:

• To the name of the proposal the following tag will be added: "[QA-ORPHAN]".

• To the describtion of the proposal the following text will be added at the top: "This proposal has been marked orphan by PEAR-QA on <DATE> because of the inactivity of the proposer. This means, that the proposal is invalid from this date on. If you have a similar proposal or want to re-activate this proposal, feel free to create a new PEPr proposal for it.".