Merge branch 'develop' into mesa

* develop:
  add easyconfig gperftools-2.5-intel-2016b.eb
  add easyconfig gperftools-2.5-intel-2016b.eb, add easyconfig libunwind-1.1-intel-2016b.eb
  Circos 0.69-2 using ictce 5.5.0 toolchain
  clean up libxml2 easyconfigs according to updated libxml2 easyblock
  Add comment in patch about it's purpose
  Add CMake/3.6.1 for intel/2016b