isis3 version defined in multiple places

[ihumphrey]

The isis3 version is defined in 3 places that I could find:

• isis/version contains the version number, date, and build status (alpha, beta, stable)
• isis/CMakeLists.txt contains VERSION, VERSION_DATE, and RELEASE_STAGE variables
• isis/CMakeLists.txt hard-codes the library version number (libisis3.6.0.${SO})

These should be consolidated so we don't have to maintain 3 places for versioning.

Also, the isis3_dependencies repo defines versioning for isis3 in its recipes/isis/meta.yaml file.

[ihumphrey]

Another location: isis/cmake/CMakeLists.txt

[jlaura]

It looks like this is still a problem. Specifically, https://github.com/USGS-Astrogeology/ISIS3/blob/dev/isis/CMakeLists.txt#L421

Looks like the libsisis.so is still trying to removeversion 3.6 even though at the top is 3.9. The fact that this has not been an issue suggests that the commands to execute the rm are not needed?

[jessemapel]

@jlaura See #3365 for the cmake version and library version non-sense. This has also gotten worse as it's defined in our conda-build recipe too 🎉

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[jessemapel]

This has largely been resolved with #3992 and the meta.yaml is kind of intractable.