The spiral-software package had a number of extensions, but does not
work unless they actually exist in the spiral software prefix (creating
a view is not sufficient). With the removal of "spack activate"
(different from "spack env activate"), a new approach is needed to
support optional components of `spiral-software` . This commit updates
the spiral-software package to copy the dependency installations into
its own prefix.
This commit also adds versions for `fftx` and `spiral-software`, as
well as an optional `spiral-software-jit` package.
57cd822fb7