Setup and tweak rayon, serde, blas features for no-std changes #889
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rayon: implies std, because threads do.
serde: works fine without std.
blas: works fine without std if we use libc (libc is a new dependency
for this feature flag, but it's already used by blas transitively).
A slight hack is used for rayon (renaming the dependency) because we
need to use a feature flag to enable std in this crate too.