Add support of continua with variable number of degrees of freedom
A classical continuum can only translate in space and hence has as many degrees of freedom as spatial dimensions. A number of research fields (e.g. atomistics, structural trusses, magnetism...) require an enriched continuum that entails further, e.g. rotational, degrees of freedom. Examples for such continua can be found under the names Cosserat or Kelvin medium.