…upsream_develop

* commit 'f7026a058b63f5a3109691e2c3871ee77c08f756': (1881 commits)
  Version 19.8.1 of PLASMA  (spack#12299)
  new package: py-exodus (spack#12291)
  ncurses: fix pic and opt flags (spack#12272)
  pumi: new version 2.2.1 (spack#12282)
  tests: explain and test dependency flattening routines (spack#11993)
  graphviz package: add MacOS fixes and quartz support (spack#11128)
  Overhaul numpy package (spack#12170)
  mirrors: mirror config should use spack variable expansions (spack#9027)
  stacks: fix reference handling in env.write() (spack#12096)
  fltk: fix about variable types (spack#12292)
  Avoid sending empty reports to codecov (spack#12293)
  Packages/musl (spack#12288)
  c-blosc package: Add -std=gnu99 flag for gcc (spack#11959)
  Move new packages from tutorial to builtin (spack#12289)
  Balay/amrex 19.08 (spack#12287)
  openPMD-api: pre-load depend libs (spack#12279)
  Add version 19.8.0 of PLASMA (spack#12275)
  Add version 2.5.1 of MAGMA released today (spack#12274)
  ginkgo: add maintainers (spack#12273)
  new package: py-backports-tempfile (spack#12261)
  ...

# Conflicts:
#	.travis.yml
#	var/spack/repos/builtin/packages/moab/package.py
#	var/spack/repos/builtin/packages/mofem-cephas/package.py
#	var/spack/repos/builtin/packages/mofem-fracture-module/package.py
#	var/spack/repos/builtin/packages/mofem-users-modules/package.py
#	var/spack/repos/builtin/packages/petsc/package.py

* Remove unnecessary setting with buggy prefix

Spack adds installation prefix by default and the "self." is missing

* Add version 19.8.1 of PLASMA