fix graph compatibility with SICStus re-export declaration. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@2037 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1603 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1602 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
improve redblack trees and use it to reimplement association lists and to have better implementation of several graph algorithms. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1591 b08c6af1-5177-4d33-ba66-4b1c6b8b522a