Small update in matlab export filter
update to correct cohesive behaviour at full damage (or damage variable predicted > 1)
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim into XFEMDevelopment_Martin

Conflicts:
	src/sm/intmatbilinczfagerstrom.C
Added support for cz-parameter mu
Added support for setting cross sections to elements using sets. Also added material number to the cross section so it is not necessary to define cross section an material number on element level in the input.
Bug fix in intmatbilinczfagerstrom.C
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim into XFEMDevelopment_Martin
Work in progress:

Adding a new element class: StructuralInterfaceElement and a corresponding StructuralInterfaceCrossSection.
This will separate interface elements (cohesive zone elements) from regular structural elements.
These files are in development and are totally unchecked!
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim
Updated the structural cross sections such that they can use their own material instead of asking the element. Only used if materials are given for the cross section.
Removed updateYourself in material models derived from the RheoChM material. Instead the temporary 'hidden' variables are set in the method 'computeHiddenVars' called at the end of giveRealStressVector.
Update of gausspoint: now updates the integration point statuses directly and does not ask the element for the material.
Update in ShellBaseXFEM to use a list of interface materials instead of a single material - breaks backward compability.
Fixed bug with mismatching enums regarding coord inate systems in Shell7Base.
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim
Fixed some compiler warnings.
New cohesive zone model added IntMatBilinearCZJansson (integrated analytically)
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim into XFEMDevelopment_Martin
bug fix IntMatBilinearCZJansson
Merge branch 'master' of github.com:JimBrouzoulis/OOFEM_Jim