Merge branch 'master' into staging

* master: (39 commits)
  python.pkgs.pybfd: move to python-modules
  documentation: python 2.6 is no more
  documentation: python3Packages is python36Packages
  wireguard: 0.0.20171101 -> 0.0.20171111
  php_excel: init at 1.0.2
  libxl: init at 3.8.1
  matrix-synapse: 0.24.1 -> 0.25.1
  grafana: 4.6.1 -> 4.6.2
  linux: 4.4.98 -> 4.4.99
  linux: 4.9.62 -> 4.9.63
  linux: 4.13.13 -> 4.13.14
  nixos/zsh: add the type for enableAutosuggestions option
  zsh-powerlevel9k: init at 2017-11-10
  fio: 3.1 -> 3.2
  filebench: rehash source
  nano: 2.8.7 -> 2.9.0
  bonnie: replace dead source link
  less: 520 -> 529
  strace: 4.19 -> 4.20
  iperf: 3.2 -> 3.3
  ...