add support for specifying conflicts in easyconfig files

[boegel]

We should add support for specifying conflicts between packages in easyconfig files, optionally version-based.

For example, openssl v11 conflicts with ssleay < v1.

One idea is to employ the CUDF format for supporting this.

[JackPerdue]

I think I left a comment in another issue requesting this feature. Didn't see this issue at the time. Anyway, its really needed for Anaconda2/Anaconda3/Python(/IntelPython). For now I'm making the change manually e.g.

conflict("Anaconda")
conflict("Anaconda2")
conflict("Anaconda3")
conflict("Python")
conflict("IntelPython")

[surak]

And how is it done manually, since this since to be a very low priority feature? Can one add the line on the easyconfig itself to be part of the module?

[ocaisa]

You can do it with modluafooter/modtclfooter (see https://docs.easybuild.io/version-specific/easyconfig-parameters/?h=modluafooter#modules-parameters)

[surak]

Thanks, I did it exactly like that.