Log Message:
Update to 0.19.2:

Gaupol 0.19.2
=============

 * Allow preview of unsaved documents (#661242)
 * Use subtitles from selected range if applicable in the Transform
   Positions dialog (#663158)
 * Fix mplayer preview command to work if gaupol was started as a
   background process (with &) from a terminal window (#660035)
 * Fix TypeError when speech recognition stopped in the middle of a
   subtitle
 * Fix IndexError when speech recognition finished with no speech
   detected (#659411)
 * Fix UnicodeDecodeError when reading configuration file (#661123)
 * Rename manifest directory in source tarball to avoid clashes with
   MANIFEST file on case-insensitive filesystems