Added new class/method to wrap obsolete function GUID_CREATE and use replacement class SAP provides. Old function call still found in wrapper class commented out for use in older releases, which don't have the new methods from SAP yet ( 7.01 does not have it for example )
Replaced calls to function by calls to wrapper-method
Changed calculation of last date in month in ZDEMO_CALENDAR since it was calling an obsoleted function as well.
