[PATCH] Core sanity and taking build options from environment.

[Deck Pickard]

  Perhaps GUIX_BUILD (suffix with _OPTS or some such?) is not the best name
and I'm not certain if it shouldn't be stdout (why are we using error port
for "normal" communication? Emacs?), but I think it might prove useful if
user keeps being reminded his environment is polluted or not as his
intentions might have been, or it could go "only" into guix|guix --help...

To doc or not to doc,
Drp
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0001-guix-Default-to-daemon-s-default-cores-setting-of-1.patch
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0002-guix-scripts-Add-handling-of-options-from-GUIX_BUILD.patch
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