Fixed various errors in user management: until now, groups are created automatically, so when changing the  owner of a resource to a non-existing group, we have to create the group transparently.
Fixed various errors in user management: until now, groups are created automatically, so when changing the 
owner of a resource to a non-existing group, we have to create the group transparently.

svn path=/branches/DLN/eXist-1.0/; revision=4185

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