* packages/phist: add variant 'fortran' to enable/disable building the Fortran bindings
* xsdk: add phist
* packages/xsdk: add a comment reg. updating phist dependency
* packages/phist: +fortran variant is only for versions 1.7:
* packages/phist: update comments
* xsdk: forgot to specify kernel library for phist (picked tpetra, assuming trilinos+tpetra will be installed)
* packages/phist: add variant 'openmp' to allow disabling OpenMP
* phist: fix compile error due to missing -lm
* flake8: fix warnings
* packages/phist: fix cmake flag: XSDK_ENABLE_Fortran (rather than XSDK_BUILD_Fortran)
* packages/phist: allow disabling building the scamac matrix generator (which causes trouble on some systems)
* packages/xsdk: disable scamac within phist because it caused problems for @balay and is not essential for now
* packages/phist: actually disable scamac via cmake if ~scamac
* phist: disable openmp from xsdk
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