Update eye distance updates also eye separation for glasses projection

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28625 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3401 ShortestDistance third parameter added.
The user can set the value, which tells the algorithm where should it search for roots.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28626 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e