* zfp: several package improvements
- add variants for build targets, language bindings, backends
- ensure selected variants are compatible with zfp version
- point to GitHub (not LLNL) tar balls
- add dependencies
- update link to homepage
- add maintainers
* zfp: address suggestions by Spack team
- use conflicts() instead of raising exceptions
- use define() and define_from_variant() where applicable
* Apply suggestions from code review
Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>
* Fix ZFP OpenMP build.
Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>
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