make PXR_VERSION a valid / comparable c/c++ integer #886
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Description of Change(s)
currently, PXR_VERSION is defined as "0197" - which isn't even a valid
c/c++ integer literal, as the '0' will cause it to be interpreted as an
octal value, but '9' isn't an octal digit. Even if it didn't have the
leading 0, however, it still wouldn't be useful for comparing numerically,
because we would have, ie, 19.07 < 18.11:
197 < 1811
Fixes Issue(s)