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...I remembered that it produced compiler-dependent results.

This is done to make the determination of energy parameters more robust.
It seems to break some tests. But this does not necessarily mean that it
is wrong.

I fixed the issue by reducing a threshold in inpgen/bravais_symm.f. This
leads to less symmetry operations that are found if the specified Bravais
matrix is not precise enough. I hope this does not prevent the detection
of symmetry operations that we clearly want to find. Otherwise we have
to find a more sophisticated fix for the issue.

specify -DCPP_OLDINTEL to deactivate parts of the code that did
not compile; mainly the order of USE statements was changed or
ONLY was added to avoid confusion of the compiler.