minor change of keyword


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6789 04224531-1f84-46d8-96ce-875b9e37dce3
minor consistency changes for model pde


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6790 04224531-1f84-46d8-96ce-875b9e37dce3
modified test case related to model pde


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6791 04224531-1f84-46d8-96ce-875b9e37dce3