going with GCCcore for now

alter sanity_check_paths to match the sanity standards of EB (which may or may not be entirely sane)

Revert "notify EasyBuild maintainers of failing tests"

This reverts commit 953a508d.

fix reference to github.com/hpcugent in GROMACS easyconfig

notify EasyBuild maintainers of failing tests

{bio}[goolfc/2017.01] GROMACS v2016.3

{bio}[foss/2016b] Sailfish 0.10.1

{bio}[foss/2016b] Biopython v1.68 w/Python 3.5.2(REVIEW)

add Rtsne as extension to R 3.4.0

{bio}[intel/2017a] Seurat v1.4.0

{devel}[foss-2016b] Boost 1.54.0

{bio}[GCCcore/5.4.0] Bowtie 1.1.2

{bio}[GCCcore/5.4.0] BWA 0.7.15

{bio}[foss/2016b] Salmon 0.8.2

{bio}[foss-2015b] ngmlr/0.2.6 (REVIEW)

{lib}[intel/2017a] geopy v1.11.0 w/ Python 3.6.1

{chem}[intel/2017a] yaff v1.1.3

Fix ubsan error blocking build of GCCcore 6.1.0, 6.2.0, 6.3.0 with system GCC 7.1

get rid of references to 'hpcugent' organisation after move to github.com/easybuilders