Replace 0=0 constraint by lambda(i)=0


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6904 04224531-1f84-46d8-96ce-875b9e37dce3
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git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6905 04224531-1f84-46d8-96ce-875b9e37dce3
The weighted projector for internal discontinuous is now done in a weak manner also for edge dofs. Modifications provided mainly by Juha. 


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6906 04224531-1f84-46d8-96ce-875b9e37dce3