Merge pull request #391 in ZP/z-push from feature/ZP-1073-script-to-list-all-shared-calendars to develop

* commit '9b4d091e':
  ZP-1073 Use exit() instead of die().
  ZP-1073 list-shared-folders script, incl. usage examples (in file).
  ZP-1073 Refactor Utils::GetFolderOriginFromId() into GetFolderOriginStringFromId() so GetFolderOriginFromId() returns a value comparable to DeviceManager::FLD_ORIGIN_*.