* commit '286d4693':
  ZP-853 Allow a return value of false for single folders when calling Backend->GetFolderStat(). In this case, in Sync the exporter will always run for these folders. In Ping the initial checkup (generate fake changes and force a Sync on this folder if the stat does not match or expired) can not be executed.
  ZP-856 Remove while(1)s.