write_depth/3

overflow handlings and garbage collection
Several ipdates to CLPBN
dif/2 could be broken in the presence of attributed variables.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1474 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/exec.c

@@ -1793,7 +1793,6 @@ Yap_InitYaamRegs(void)
   RESET_VARIABLE((CELL *)Yap_GlobalBase);
   DelayedVars = Yap_NewTimedVar(MkIntTerm(0));
   WokenGoals = Yap_NewTimedVar(TermNil);
-  MutableList = Yap_NewTimedVar(TermNil);
   AttsMutableList = Yap_NewTimedVar(MkIntTerm(0));
 #endif
   GcGeneration = Yap_NewTimedVar(MkIntTerm(0));