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This takes two software versions in the usual b"x.y" form
and split them on the decimal character, converting both parts
to ints, e.g. b"3.2" becomes (3, 2).
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C{version1} is greater than or equal to C{version2}.
@param version1: The first version to compare as C{bytes}.
@param version2: The second version to compare as C{bytes}.
@return: C{True} if the first version is greater than or equal to
the second.
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