so that I don't have an excuse to call current_stream(_,_,S) with S
something not a stream.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@39 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
new Makefiles for documentation;
user_{input,output,error} streams are now aliases;
restore YapLibDir
support $(DESTDIR)
fix call_residue/2
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@8 b08c6af1-5177-4d33-ba66-4b1c6b8b522a