bugfix GNU_SOURCE

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add savannah source, reshuffle order

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
gnu in GNU_SOURCE url

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
undo 3028dca, no good

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
Merge branch 'bugfix_GNU_SOURCE' of github.com:fgeorgatos/easybuild-framework into bugfix_GNU_SOURCE
add _SOURCE suffix to XORG source url constants
add support for nameletter and nameletterlower templates, test via unit tests
add pypi source URL constants
alphabetically order source URL constants, clean up TODO comment
fix typo
Merge pull request #793 from boegel/bugfix_GNU_SOURCE

fix GNU_SOURCE constant, add XORG source url constants, add nameletter and nameletterlower templates