[MERGE][#74101] Make `bzr remove-tree` not remove trees with uncommitted changes by default

[Aaron Bentley]

Aaron Bentley has voted approve.
Status is now: Conditionally approved
Comment:
Looks fine.  We should consider making this hidden, since 'bzr 
reconfigure' can do this.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C1220165571.6914.11.camel%40nemo%3E
Project: Bazaar