* Changed every 'fpic' variant to 'pic'. fixes#2463
Every variant that activates compilation of position independent code
has been changed to 'pic'. Hardcoded compiler flags in packages have
been substituted with `self.compiler.pic_flag`.
* Changed literal uses of '-fpic' to 'self.compiler.pic_flag'
* Adding Nalu package.
* Fixing flake8 stuff.
* Fixing flake8 stuff.
* Reorganizing trilinos package file a little to make it less verbose.
* Reorganizing trilinos package file for more general use as well as use as a dependency of the Nalu package. Setting fpic as default for yaml-cpp and superlu.
* Explicitly stating fpic variants in dependent packages.
* Updating nalu and trilinos package files with suggested changes.
* Fixing formatting issues. Making suggested changes.
* Fixing formatting.
* Reducing amount of explicit variants in Nalu. Adding suggested changes to Trilinos package file.
* Making suggested changes to Nalu package.
* Turning off superlu-dist variant.
* Cleaning up yaml-cpp file.
* Fixing pnetcdf requirements in trilinos.
- Added a new interface for Specs to pass build information
- Calls forwarded from Spec to Package are now explicit
- Added descriptor within Spec to manage forwarding
- Added state in Spec to maintain query information
- Modified a few packages (the one involved in spack install pexsi) to showcase changes
- This uses an object wrapper to `spec` to implement the `libs` sub-calls.
- wrapper is returned from `__getitem__` only if spec is concrete
- allows packagers to access build information easily
* Updating SuperLU package file with ability to build version 4.3 (before they added cmake) with external blas or internal blas, and added capability to build the latest version 5.2.1 (with cmake) with internal blas.
* Updating SuperLU package file with suggested changes, i.e. reorganizing installation methods based on version, adding cmake dependency when necessary, removing any use of internal blas, and also adding fpic variant.
* Fixing flake8 failures.
* 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
