* Changed make command to support new slate build variable 'blas='
* Updated to use package's "make install" target
* Added variant 'blas' to support switching blas provider and removed legacy 'mkl' variant.
* Fixed problem caused by systems which use a non-bash /bin/sh
* Removed blas= variant in preference for setting blas provider via spec syntax (e.g., ^openblas).
* Fixed formating
* Changed to MakefilePackage and cleaned up make argument generation
* Implemented "edit" method
* Removed blank line
* Sqitched to using mpi compiler wrapper variables
* Update var/spack/repos/builtin/packages/slate/package.py
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
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