* commit '09493d72':
  ZP-1251 Aggregate Ping announcements about changes.
  ZP-1257 Remove statically configured shared folders from the list sent to ASDevice->SetAdditionalFolderList().
  ZP-1268 Undefined variable: name in z-push-admin.
  ZP-1259 Fixed typo in a variable.
  ZP-1259 Check if sm->data is empty for SendMail.
  ZP-1240 Also HTML-trucate bodies from IMAP.
  ZP-1255 Directly use sharedUser if it's an email address. Enables sending in multi-company environments.
  ZP-1256 Set backend2folderidCache of ASDevice to false, so it can be rebuilt.
  ZP-1256 Rebuild backend2folderidCache of ASDevice if it's not available.
  ZP-1256 Rebuild backend2folderidCache of ASDevice if it's not available.
  ZP-1250 Search for X-Push-Sender only in the headers.
  ZP-1240 HTML safe truncate streams containing HTML data.
  ZP-1240 Add HTML safe truncation options to stream wrappers.
  ZP-1240 Add parameter $htmlsafe (default false) to Utils::Utf8_truncate().