Moved wall clock abstraction from de-webapp to de-commons

The ProvidesTime interface and its default implementation,
DefaultTimeSource were moved to de-commons because of the general
usefulness of this abstraction.
Updated fileupload and getuserhomedir properties.
Removed obsolete MakePublicRequestServlet.
Removed obsolete UploadServlet.
Removed obsolete DonkeyClient.
Fixed GWT IDE errors in Confluence classes.

Changed the AsyncCallback params to Void in ConfluenceServiceAsync and ConfluenceServiceFacade.
Merge branch 'master' into STABLE