Added parameter substitution to TiVoWeb.
Although the parameter list in the TiVoWeb interface is pretty much hard-coded because of the messing around with date/time fields, I had documented a possible way to hard-code extra parameters.
This was by adding new fields to the start of the variable part of the URL in the dabdig.ini
This works well - but requires the parameters to be fixed. By now making them use the substitution mechanism it means that other fields can be calculated dynamically - for example, a version of manrec supports the episode name being passed in, so this could be handled in DABDig by adding Episodestr=$EP& to the end of the URL in the ini file.