Project FEniCS: corrected scotch package file

 Changes to be committed:
	modified:   FEniCS/packages/scotch.package
Project deal.II: removed make test from petsc and slepc packages

 Changes to be committed:
	modified:   deal.II/packages/petsc.package
	modified:   deal.II/packages/slepc.package
Project FEniCS: added CentOS7 support

 Changes to be committed:
	new file:   FEniCS/platforms/supported/centos7.platform