reactivated "add" on server.
disabled slow sync

slow sync will now send local changes to server and then do a refresh.
This is done for stupid egroupware... sorry, if somebody uses this with
another server.
push up lastRev on deleteAllItems
2013-06-14 => 0.1.29

2013-06-14 => 0.1.29
- fixed rev for delete all. Will not send all delete commands to server,
if no update did happen.
- hack to disable slow sync. Now only sends recent changes to server and
then does a refresh from server.
- readded add, needed for contacts on eGroupware
added config for slow sync hack.