Adding ProveDetails support


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24495 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE in last commit fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24496 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e