Andrew,

> > In my opinion, it would be useful to have a
> > method 
> >    const std::vector<std::pair<unsigned int,double> >*
> >    get_constraint_entries (unsigned int line) const;
> > that returns a pointer to the entries field in the CM in case a DoF is
> > constrained, and a NULL pointer if it is not constrained. Then, one
> > could easily add all kinds of constraints again with the function
> > add_entries
> 
> agreed. that would be extremely useful.

Ok, I just checked in that functionality. Moreover, I tried to better
explain what the transformation into local index space actually means
for the add_selected_constraints method. 

Best regards,
Martin

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