Improved robustness of structured mesh mapping.


git-svn-id: https://elmerfem.svn.sourceforge.net/svnroot/elmerfem/trunk@6017 35e42291-063b-0410-a9f9-998d8d6728aa
Improved on ElementMetric error reporting 


git-svn-id: https://elmerfem.svn.sourceforge.net/svnroot/elmerfem/trunk@6018 35e42291-063b-0410-a9f9-998d8d6728aa
minor edit


git-svn-id: https://elmerfem.svn.sourceforge.net/svnroot/elmerfem/trunk@6019 35e42291-063b-0410-a9f9-998d8d6728aa