30-implementin…

.gitmodules
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			[submodule "extra_packages/extra-materials"]
			path = extra_packages/extra-materials
			url = git@lsmssrv1.epfl.ch:akantu-extra-materials.git
			[submodule "extra_packages/igfem"]
			path = extra_packages/igfem
			url = git@lsmssrv1.epfl.ch:akantu-igfem.git
			[submodule "extra_packages/parallel-cohesive-element"]
			path = extra_packages/parallel-cohesive-element
			url = git@lsmssrv1.epfl.ch:akantu-parallel-cohesive.git
			[submodule "extra_packages/traction-at-split-node-contact"]
			path = extra_packages/traction-at-split-node-contact
			url = git@lsmssrv1.epfl.ch:akantu-traction-at-split-node-contact.git
			[submodule "extra_packages/students-extra-package"]
			path = extra_packages/students-extra-package
			url = git@lsmssrv1.epfl.ch:students-extra-package.git
			[submodule "extra_packages/phase-field"]
			path = extra_packages/phase-field
			url = git@lsmssrv1.epfl.ch:akantu-phase-field.git