fix empty moduleclass in FLANN easyconfig, make sure it doesn't happen again

{vis}[intel/2016a] FFmpeg v3.0.2

{vis}[intel/2016a] PCL v1.7.2 (REVIEW)

drop toolchainopts from Eigen easyconfigs, since it is headers-only

modify easyconfig PCL-1.7.2-intel-2016a-Python-2.7.11.eb, modify easyconfig VTK-6.3.0-intel-2016a-Python-2.7.11.eb

add easyconfig PCL-1.7.2-intel-2016a-Python-2.7.11.eb, add easyconfig VTK-6.3.0-intel-2016a-Python-2.7.11.eb, add easyconfig Eigen-3.2.8-intel-2016a.eb

{}[intel/2016a] FLANN v1.8.4

{math}[dummy/dummy] Mathematica v10.4.1

{compiler}[dummy] GCC 5.3.0-2.26 (REVIEW)

clean up binutils easyconfigs to use binutils easyblock