Jef Driesen 5824254cf5 Add support for the INTR protocol variant.
There are two variants of the vtpro communication protocol: the existing
MOD variant and the new INTR variant. The main difference is in the
initialization sequence, with two completely different response packets:

   MOD--OK_V2.00
   INTR-OK_V1.11

The INTR variant does not appear to return useful information in the
version packet.
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