use arrays to implement catch and throw instead of record

cleanup queues at top-level and at catch-throw.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@69 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/init.c

@@ -820,6 +820,7 @@ InitCodes(void)
   heap_regs->no_of_modules = 1;
   heap_regs->primitives_module = 0;
   heap_regs->user_module = 1;
+  heap_regs->db_queues = NULL;
   heap_regs->atom_abol = LookupAtom("$abol");
   AtomAltNot = LookupAtom("not");
   heap_regs->atom_append = LookupAtom ("append");