Added functions for _3d, _PlaneStress, _PlainStrain, _1d for giveRealStressVector. Added implementtion for linear elastic materials + rankinemat (which specifically supports planestress).
Fixed AbaqusUserMaterial to always run as 3d.
Simplifying the functions for reducing the 3d matrix to other forms in structural material.
Removed need for special cross-section functions for the RheoChain material, instead the model now properly respect the ElasticStiffness value in MatResponseMode.
Fixed bug in beLocalCoordinateTransformation and added inverse coordinate transformation  in rotatedWith
Update of StructuralInterfaceMaterial + added corresponding material status

Converted cohesive zone model by Fagerström from StructuralMaterial to StructuralInterfaceMaterial
Updated Shell7BaseXFEM to use new StructuralInterfaceMaterial
Merge branch 'master' of github.com:Micket/oofem

Conflicts:
	src/oofemlib/floatarray.C
	src/oofemlib/floatarray.h
	src/sm/misesmat.C
	src/sm/shell7base.C
	src/sm/structuralmaterial.C