Changes
* UBIK supports Checkout and Release of UBIK Objects now
** UBIK provides a central mechanism which gives exclusive access (edit right) to UBIK objects for one user
** The Checkout mechanism is provided via the UBIK Web Service(CheckOut, Release)
** Objects supporting the Checkout feature must implement [[SYCLS_EXCLUSIVE_ACCESS|Exclusive Access classification object]]
** UBIK Content Objects provide two new customizable methods (OnBeforeCheckOut, OnBeforeRelease) giving the possibility to define in customizing whether checkout / release of one object is allowed
