Bug: REVISION variable not up to date in Makefile-options

[Janosch]

This is kind-of the same issue like in BoCA: enzo1982/BoCA#8

In https://github.com/enzo1982/smooth/blob/master/Makefile-options, the REVISION is set to 0, although the latest shipped version is 0.9.6.

This is probably not an issue for most people, but it leads to incorrect file names for libraries which is a (small) problem for people packaging smooth (I am doing this for macports).

I think it should be set to 7, assuming the upcoming version is 0.9.7.

[enzo1982]

Please see my answer in enzo1982/BoCA#8. It's the same here, compatibility level, not release micro version number.