- start time is now recorded as a timestamp
- typo fix: match.groups() -> match.group()
- Subtitle generation is only requested if the presentation has video on channel 1
* renamed the 'data' dict to 'arec_data' and made sure all references are consistent
* switched the recorder identifier from hostname to description, because there was a wild \n in the hostname for unknown reasons
* removed timezone awareness from starttime and endtime to make them compatible with times loaded from daisy
Also moved the code for creating a basic jobspec and pulling information from
the relevant daisy booking into the preprocessor superclass so it can be
called by both the cattura and arec preprocessors.
