Some minor changes to the StrideProjector. 


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6741 04224531-1f84-46d8-96ce-875b9e37dce3
Test case for potential difference driven case for rotating BCs with MagnetoDynamics.


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6742 04224531-1f84-46d8-96ce-875b9e37dce3
Enable flux BCs for 'piola' elements.


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6743 04224531-1f84-46d8-96ce-875b9e37dce3