Merge pull request #512 in ZP/z-push from bugfix/ZP-1177-koe-private-appointments-are-not to develop

* commit '35f54972':
  ZP-1177 Fixed description.
  ZP-1177 Renamed ImportChangesICS->isMessageInSyncInterval() into ImportChangesICS->isModificationAllowed() which also fails if a private object in a shared store is edited. Refactored code into MAPIUtils::IsMessageSharedAndPrivate().
  ZP-1177 Strip private data from objects that support that, else continue to ignore them. SyncObject->StripData() now takes uses a flag decide how to strip.