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When building with or without modules, it will be useful to selective suppress building of some components.

• compile all of OpenFOAM, but without any modules
• later compile a module indvidually

I'm thinking of places where we might want to have a module such as visualization, or adios added as an additional RPM or spack package on top of an existing OpenFOAM installation.

Ideas:

1. If a Allwmake.disabled exists at the same level as a Allwmake file, skip it.
2. Use a Allwmake.override instead of Allwmake file at the same level.
3. Rename Allwmake file to Allwmake.enabled and symlink back to Allwmake when it is enabled.
4. Add in a minor logic into the overridable Allwmake. For example,

   enabled=true
   if [ "$enabled" != true ]
   then
       echo "$0: is disabled"
       exit 0
   fi

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