Ensure the progress dialog is fully gone when the Stop() method returns.
(Fixes issue #671) : Crash editing properties from the repository browser


git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25963 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
Document the sync feature.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25964 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac