Implement missing functions in Dequeue.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1670 b0c55286-4f34-0410-a049-a1e7e93b0762
Add 'qsetfirst!' and 'qsetrest!'


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1671 b0c55286-4f34-0410-a049-a1e7e93b0762
Fix HyperDoc errors in 'Dependants' and 'Users'.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1672 b0c55286-4f34-0410-a049-a1e7e93b0762
fix ")version" command

git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1673 b0c55286-4f34-0410-a049-a1e7e93b0762