250px as min width for algebra

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26932 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
call storeUndoInfo() from TouchApp because of enable/disable save/undo/redo

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26933 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
changes because of gwt-bug (focus)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26934 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Open button working for local files

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26935 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e