- work with read-only flag for static additional folders,
- change IBackend->Setup() to include a read-only flag,
- fixed Setup() read-only flag for default Backend, Combined and
DiffBackend,
- changed ChangesMemoryWrapper for read-only Setup() flag,
- added read-only flag to SyncFolder,
- added comparision method for SyncObjects that returns a human readable
output with data and differences (needs improvement),
- Check status before doing GetImporter() in Sync,
- recheck folderstat after export to catch ReplyBack changes,
- check for backendIds in resync folder of z-push-admin

For Zarafa:
- check for read/secretary permissions in Setup() depending on flag,
- added template for email notification to zarafa config,
- implemented ZarafaChangesWrapper (common wrapper for exporter &
importer) - decides state based what needs to be done,
- implemented ReplyBackImExporter to process changes on read-only
folders and reply back with the original data (overwriting the changes
on the mobiles),
- added simple StateObject to hold ReplyBack states,
- always return the ZarafaChangesWrapper when content im/exporters are
being requested,
- SendMail() should always work on the default store, not the current
store (when sharing folders),
- changed GetFolderStat() to work with ReplyBack cases.

Released under the Affero GNU General Public License (AGPL) version 3.