xExtendShapeGeneratorBase now use a DATAMAMANAGER to store the
    xExtendShapeFcts instead of AOMD tag mechanism.

    since there is no tag to associated to xExtendShapeFcts, getTag() member is removed and replaced by : getExtendedShapeFcts

    xExtendShapeGeneratorBase is not template any more on typename ITERFRONT since
    this type was only used by the constructor. Only the constructor is
    template ont ITERFRONT.

    consequence of the above implyied slight changes in xSpaceExtendedShape.cc/h
    and TLSVelocity.h/_imp.h xApproxFunctionExtendedShape.h

    xFEM/src/xAttachableExtendShapeFcts.h is not used any more and moved to attic.