sync with aldor version

git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1679 b0c55286-4f34-0410-a049-a1e7e93b0762
fix rename 'setelt' to 'setelt!'

git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1680 b0c55286-4f34-0410-a049-a1e7e93b0762