Parsing DVB-T/S/C Teletext into plain text

Believe it or not, tens millions of people are still reading Teletext. The biggest provider of on-screen news, the BBC, has shut down its CeeFax in 2012, but many stations all over Europe still broadcast a teletext signal1. There even is a (semi-) regular Art Festival about teletext!

For those not in the know: Teletext, invented by the BBC in 1972/1974, is a digital signal, that puts a 40×25, 8 color character grid onto your screen. Rudimentary (pseudo-)graphics in the form of a graphical character set are available too. The information is sorted into pages (often called tables), from 100 to 899, and subpages2.
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