fix build deps for GObject-Introspection + sync easyconfigs for version 1.47.1

{data}[foss/2016a] HDF5 v1.8.16 serial (REVIEW)

{numlib}[foss/2016a] qrupdate v1.1.2 (REVIEW)

{tools}[foss/2016a] GLPK v4.58 (REVIEW)

{vis}[foss/2016a] gnuplot v5.0.3 (REVIEW)

{devel,vis}[foss/2016a] Mesa 11.1.2 (REVIEW)

{vis}[foss/2016a] libXi 1.7.6 (REVIEW) 

add checksums in SuiteSparse easyconfigs

Update source_urls parameter in ScientificPython easyconfig files

use XORG_LIB_SOURCE in libICE/libSM easyconfigs

Libxslt-1.1.28 for foss-2016a

{vis}[foss/2016a] Qt v4.8.7 (REVIEW)

Merge branch 'develop' of github.com:hpcugent/easybuild-easyconfigs into 20160321205140_new_pr_GLib2475

{vis}[intel-2016a] Pillow 3.2.0 (REVIEW)

{lib}[foss/2016a] GraphicsMagick v1.3.23 (REVIEW)

{vis}[foss/2016a] libXrandr 1.5.0 (REVIEW)

consistently use XORG_*_SOURCE constants

pkg-config include as builddependencies

{vis}[foss/2016a] libXft v2.3.2 (REVIEW)

{vis}[foss/2016a] libXext v1.3.3