RFC: Moving grabber versioning away from CVS $Id$

With a future move away from CVS, grabbers will lose the ability to
use the CVS "$Id$" file version tag, which is heavily used at the
moment to provide data for $grabber --version.

I want to start the discussion to see if there is a consensus to move
grabbers away from using the hardcoded CVS $Id$ tag to a more regular
internal version number that is manually incremented after a grabber
is updated.

Thanks in advance for any comments/thoughts,
Nick

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