clean up libxml2 easyconfigs according to updated libxml2 easyblock

specify correct MPI target in FDS easyconfigs

{vis}[intel/2016b] X11 v20160819 (REVIEW)

clean up sources spec for gdc-client bundle easyconfig

{data}[intel/2016b] dask v0.11.0 (REVIEW)

{lib}[intel/2016b] pandas v0.18.1 (REVIEW)

add easyconfig dask-0.11.0-intel-2016b-Python-2.7.12.eb, add easyconfig dask-0.11.0-intel-2016b-Python-3.5.2.eb

add easyconfig pandas-0.18.1-intel-2016b-Python-2.7.12.eb, add easyconfig pandas-0.18.1-intel-2016b-Python-3.5.2.eb

{math,phys}[ictce/5.5.0] HEALPix 2.20a,  CRPropa 2.0.3

add ictce easyconfig file for VCFtools

Keep using system python though jhbuild can be used with any python2 if it is leveraged during a build process

since we have a bin directory