Merge remote-tracking branch 'origin/develop' into biostuff

* origin/develop: (114 commits)
  add missing versionsuffix & use it in sources spec
  {bio}[dummy] SRA-Toolkit 2.8.2-1
  rename sratoolkit 2.5.7 to SRA-Toolkit to match already existing easyconfigs
  Update CGNS-3.3.1-foss-2016b.eb
  bump version of ROOT dependency
  add CMake + pkg-config as build deps, clean up configopts & co handled by updated ROOT easyblock
  moving moduleclass to bottom of the easyconfig
  Update CGNS-3.3.1-foss-2016b.eb
  add missing checksums
  bump version & fix source URL for ROOT, add checksums for ROOT & CFITSIO
  add check to see whether binutils is included as build dep when GCCore toolchain is used
  adding easyconfigs: PYTHIA-8.226-intel-2017a-Python-2.7.13.eb
  adding easyconfigs: XZ-5.2.3-GCCcore-6.4.0.eb, gettext-0.19.8.1-GCCcore-6.4.0.eb, libxml2-2.9.4-GCCcore-6.4.0.eb
  adding easyconfigs: ROOT-6.06.02-intel-2017a-Python-2.7.13.eb, CFITSIO-3.41-GCCcore-6.3.0.eb
  adding easyconfigs: MATLAB-2013b.eb
  Update CGNS-3.3.1-foss-2016b.eb
  fix minor style issue
  Update CGNS-3.3.1-foss-2016b.eb
  add peperr extension for R 3.4.0
  fix linking to ncurses in libreadline 7.0 easyconfig using GCCcore/6.4.0
  ...