[MERGE] Use repo.supports_rich_root() rather than repo._format.rich_root_data

[John Arbash Meinel]

John Arbash Meinel has voted +1.
Status is now: Approved
Comment:
Just a ping for Andrew to try and merge this. ISTR that he had problems 
with PQM. If you still have problems, just have one of us submit it.


For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20070301041942.GQ11086%40steerpike.home.puzzling.org%3E