Custom parsing; make it possible to have custom parsing options like [question]\t\t[answer]

There's a great resource for word lists on the web, but they're all in different formats, so I suggest we should make a "custom parse" line; you can then say exactly how the text mass has to be parsed. An example: http://www.lingolex.com/Expresen.htm. You can copy-paste the words and put in the parse line "[question] - [answer]" or something like that.