refactoring: use apr_psprintf
TWinSCPFileSystem::GetFindDataEx: check if operation is cancelled
TFTPFileSystem::ApplyTimeDifference: check parameter

(http://forum.farmanager.com/viewtopic.php?p=125786#p125786)
version info: update
Merge branch 'master' into far3

* master:
  version info: update
  TFTPFileSystem::ApplyTimeDifference: check parameter
  TWinSCPFileSystem::GetFindDataEx: check if operation is cancelled
  refactoring: use apr_psprintf