Merge branch 'develop' into clang37

* develop: (26 commits)
  remove unused Bison easyconfig
  remove unused easyconfigs
  toolchainopts puc ture added
  minor fixes
  fix versionsuffix
  fix style issues
  removed empty lines
  Do not use ld.gold for MariaDB
  Extend dependencies of MariaDB
  Move MariaDB to GNU toolchain
  Fix typos in MariaDB
  Mariadb: use libedit
  Added libedit
  Restore MariaDB-5.5.29-ictce-4.1.13.eb
  Added source_url to MariaDB
  Added Bison for foss/2015b
  Removed old MariaDB easyconfigs (untested)
  Added up to date MariaDB for foss/2015b
  Added CMake for foss-2015b
  added easyblock SCons to Serf
  ...