Changes:
15 Jan 2005: Roland Obermayer <roland@robelix.com>
* sub2srt-0.5.3
- Added support for a third input format "txtsub"
- Prompt if overwriting files
- Several minor changes
11 Jan 2005: Panayotis Katsaloulis <panayotis@panayotis.com>
- Handle both types of NTSC frame rate, as a convenient command line option
- Fixed a bug in the actual NTSC framerate