* petsc: add 64bit variant
* hypre: add int64 variant
* superlu-dist: add int64 variant
* petsc: add int64 variant
* metis: rename idx64 to int64 to make it consistent with other packages
* mumps: rename idx64 to int64 to make it consistent with other packages
* dealii: rename 64bit to int64 to make it consistent with other packages
* Turned <provider>_libs into an iterable
Modifications :
- added class LibraryList + unit tests
- added convenience functions `find_libraries` and `dedupe`
- modifed non Intel blas/lapack providers
- modified packages using blas_shared_libs and similar functions
* atlas : added pthread variant
* intel packages : added lapack_libs and blas_libs
* find_library_path : removed unused function
* PR review : fixed last issues
* LibraryList : added test on __add__ return type
* LibraryList : added __radd__ fixed unit tests
fix : failing unit tests due to missing `self`
* cp2k and dependecies : fixed blas-lapack related statements in package.py
1. --with-lapack-lib was wrong.
2. --with-MPI was wrong; set env vars for MPI wrappers instead.
3. Added version 2.10.1
4. Added shared library variant (True by default). Hypre can build shared or static libraries, but not both in the same build.
Package repositories now look like this:
top-level-dir/
repo.yaml
packages/
libelf/
package.py
mpich/
package.py
...
This leaves room at the top level for additional metadata, source,
per-repo configs, indexes, etc., and it makes it easy to see that
something is a spack repo (just look for repo.yaml and packages).
