un-hardwire version in source_url of R

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add versions 3.0.0 of R

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add Chapel v1.7 latest

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
fix Chapel as per #240

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
promote version to v3.0.1, add libpng-1.6.2

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
libpng:sources = [SOURCELOWER_TAR_GZ]

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
Merge branch 'contrib_latest_R_and_Chapel' of github.com:fgeorgatos/easybuild-easyconfigs into contrib_latest_R_and_Chapel
Merge branch 'develop' into contrib_latest_R_and_Chapel

Conflicts:
	easybuild/easyconfigs/c/Chapel/Chapel-1.6.0-goalf-1.1.0-no-OFED.eb
	easybuild/easyconfigs/c/Chapel/Chapel-1.6.0-goolf-1.4.10.eb
Merge pull request #15 from boegel/contrib_latest_R_and_Chapel

merge in develop and fix conflicts blocking PR #240
Merge pull request #240 from fgeorgatos/contrib_latest_R_and_Chapel

Contrib latest R (incl. bare for ictce 5.3.0) and Chapel