Enforce restriction that all content URLs must be of form protocol://identifier
Allow for read-only stores.
Improved tests so that it is easier, when writing a new store, to determine if the store is compliant or not.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5899 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
