Elemental cublas (#4889)

* Added a package for the MDAnalysis toolkit.

* Added a patch that allows Elemental to use cuBLAS internally.

* Added support for LBANN to use the new cuBLAS extension in Elemental.

* Added a proper variant for when LBANN does not want to use cuBLAS in
elemental.

* Added a package for the cnpy project and used it in the lbann package.

* Removed unnecessary comment lines.

* Removed blank lines

* Removed debug variant

* Add support for libjpeg-turbo

* Added additional variants for OpenCV features. Fixed bug when linking
in TIFF support, where libtiff used the regular JPEG library and
OpenCV used libjpeg-turbo.  Now libtiff can use libjpeg-turbo.

* Removed the variant for getting Elemental to use the cublas variant.
Updated the requirements for OpenCV to add new options.

* Fixed a flake8 error in OpenCV and added a path to find cnpy in lbann.

* Fixed line too long flake8 error.

* Added a flag to specify the datatype size in lbann and fixed a flake8 error.

* Added a debug build variant using hte new build_type

* Fixed flake8

* Fixed how the debug build is pushed to Elemental

* Fixed a bug in the Elemental package where the blas search flags were
being overridden by the blas link flags.  Changed how the sequential
initialization variant is implemented in LBANN.

* Added support via a variant to explicitly use mkl or openblas.  This
helps work around variant forwarding problems.

* Updated package files to address pull request comments.

var/spack/repos/builtin/packages/libtiff/package.py

@@ -35,6 +35,9 @@ class Libtiff(AutotoolsPackage):
     version('4.0.6', 'd1d2e940dea0b5ad435f21f03d96dd72')
     version('4.0.3', '051c1068e6a0627f461948c365290410')
 
-    depends_on('jpeg')
+    variant('turbo', default=False, description='use libjpeg-turbo')
+
+    depends_on('jpeg', when='-turbo')
+    depends_on('libjpeg-turbo', when='+turbo')
     depends_on('zlib')
     depends_on('xz')