feature 1697: ability to deactivate the synchronization method to add photos. git-svn-id: http://piwigo.org/svn/trunk@6365 68402e56-0260-453c-a942-63ccdbb3a9ee
git-svn-id: http://piwigo.org/svn/trunk@5932 68402e56-0260-453c-a942-63ccdbb3a9ee
git-svn-id: http://piwigo.org/svn/trunk@5526 68402e56-0260-453c-a942-63ccdbb3a9ee