6700: Better handling of version numbers in updatedatabase

6700: Better handling of version numbers in updatedatabase

Contains a few lines of code for updatedatabase routines SetVersion and TransformToNum in order to facilitate testing new db revisions which are still marked XXX.
Currently, the XXX as added in a proposed patch generates an error in the version compare. Additionally, running SetVersion while testing the upgrade is annoying and not needed. In testing stage you would like to keep your version number as is. The version number should of course be incremented when the patch is pushed. A simple test accomplishes that.

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
(cherry picked from commit c8982e1ab41ef54ba66afd3ed313e81cde307004)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>