Chris Muller uploaded a new version of Monticello to project Squeak 4.5:
http://source.squeak.org/squeak45/Monticello-cmm.586.mcz

==================== Summary ====================

Name: Monticello-cmm.586
Author: cmm
Time: 13 February 2014, 11:10:19.863 am
UUID: a4dbd656-e50a-47ba-8661-44f8c87bb3e0
Ancestors: Monticello-cmm.585

- Allow reset of the default MCRepositoryGroup.
- #newRepositoryGroupIfDefault answer the new Group or default.

=============== Diff against Monticello-cmm.585 ===============

Item was changed:
+ ----- Method: MCRepositoryGroup class>>default (in category 'accessing') -----
- ----- Method: MCRepositoryGroup class>>default (in category 'as yet unclassified') -----
  default
  	^ default ifNil: [default := self new]!

Item was changed:
+ ----- Method: MCRepositoryGroup class>>flushAllCaches (in category 'actions') -----
- ----- Method: MCRepositoryGroup class>>flushAllCaches (in category 'as yet unclassified') -----
  flushAllCaches
  	self default flushCache!

Item was removed:
- ----- Method: MCRepositoryGroup class>>new (in category 'as yet unclassified') -----
- new
- 	^ self basicNew initialize!

Item was added:
+ ----- Method: MCRepositoryGroup class>>reset (in category 'actions') -----
+ reset
+ 	default := nil!

Item was changed:
  ----- Method: MCWorkingCopy>>newRepositoryGroupIfDefault (in category 'repositories') -----
  newRepositoryGroupIfDefault
  	repositoryGroup == MCRepositoryGroup default
+ 		ifTrue: [repositoryGroup := MCRepositoryGroup new].
+ 	^ repositoryGroup!
- 		ifTrue: [repositoryGroup := MCRepositoryGroup new]!