Merge branch '212-document-code' into 'feature'

README.md

USAGE.md

conf/coupled/gamm-paper/coarse-biventricle.conf

conf/m++.conf

src/CardiacInterpolation.cpp

src/CardiacInterpolation.hpp

src/CardiacSolver.hpp

src/ExternalCurrent.hpp

src/MainCardMech.hpp

src/coupled/MainCoupled.cpp

src/coupled/MainCoupled.hpp

src/coupled/problem/CoupledProblem.cpp

src/coupled/problem/PhysiologicalProblems.cpp

src/coupled/problem/PhysiologicalProblems.hpp

src/coupled/solvers/CellModelSolver.cpp

src/coupled/solvers/SegregatedSolver.cpp

src/coupled/solvers/SegregatedSolver.hpp

src/elasticity/MainElasticity.cpp

src/elasticity/MainElasticity.hpp

src/elasticity/MultiElasticity.cpp