Fix indentation of Richardson Extrapolation and Modified Midpoint stepper.

git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2904 41b19578-b77a-4e3b-9682-c8570d237623
Fix XML Schema for testsuite elements.

git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2905 41b19578-b77a-4e3b-9682-c8570d237623