add mediation library to R 3.2.1 easyconfigs

{compiler} [GNU/4.9.3-2.25] Clang 3.7.0 (REVIEW)

{lib}[intel/2015b] pandas 0.16.2 (REVIEW)

Add foss-2015a version of pandas

{vis} [intel-2015b] Mesa 11.0.2 (REVIEW)

add CUDA-7.5.18.eb

add checksums for CGAL sources + fix source URL for CGAL 4.6.3

{math}[dummy] Eigen3: 3.2.5 & 3.2.6

{numlib} [intel-2015b] CGAL 4.6.3 (REVIEW)

{compiler} [intel-2015b] LLVM 3.7.0 (REVIEW)

add SuperLearner extension in R 3.2.1 easyconfigs

{phys}[intel/2015b] FDS 6.3.0 (REVIEW)

recent Eigen3 releases 3.2.5 and 3.2.6

Signed-off-by: Torbjörn Klatt <t.klatt@fz-juelich.de>

{lib} [intel-2015b] libdrm 2.4.64 (REVIEW)

{devel} [intel-2015b] Qt 4.8.7 (REVIEW)