Merge in ZHUB/z-push from develop to release/2.6
* commit '6ee50d45ca90a6bf2793eb21bc7a54d2d3a0a1cd': (24 commits)
ZP-1626 . Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1617 ios devices send two responses.
ZP-1624 . Added MAX_CUSTOM_FILTERTYPE control. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1626 . First version. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1624 . Replaced tabs with spaces. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1617 Meeting response sent twice on an ios device.
ZP-1625 Save device data in POST requests only.
ZP-1624 1 year custom sync filter type support. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1623 IpcMemcachedProvider: Increase maxWaitCycles value. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1621 BackendCombined: Fix typo in ImportFolderDeletion(). Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1599 Read instanceid in meetingresponse.
ZP-1609 Set common start- and end properties.
ZP-1522 BackendCardDAV: bugfix variable. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1612 BackendCardDAV: return array() in GetGALSearchResults(). Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1612 BackendSearchLDAP: return array() in GetGALSearchResults(). Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1611 CalDAV: Fix invalid content-type. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1522 BackendCardDAV: remove unfinished error handling on Logon(), add option to use '%l' in CARDDAV_PATH, CARDDAV_DEFAULT_PATH, CARDDAV_GAL_PATH and CARDDAV_CONTACTS_FOLDER_NAME. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1522 BackendCardDAV: add usage option for '%l' (local part of username) to CARDDAV_PATH, CARDDAV_DEFAULT_PATH, CARDDAV_GAL_PATH and CARDDAV_CONTACTS_FOLDER_NAME to config file. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1522 BackendCalDAV: add usage explanation for CALDAV_PATH to config file. Released under the Affero GNU General Public License (AGPL) version 3.
ZP-1522 BackendCalDAV: remove remnant code from ZP-1410, add option to use '%l' in CALDAV_PATH. Released under the Affero GNU General Public License (AGPL) version 3.
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