Fix for distance

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37594 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] make sure Distance[x+2y=4,x^2+y^2=1] gives an error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37595 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Moving Export to LAF so that we can disable it on SMART too

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37596 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] fix for Dot[(a,b,c),(d,e)]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37597 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e