Log Message:
Update textproc/sub2srt to 0.5.3

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