improve replay attacker, add deadlock tests

tests/replay/weave.pml

@@ -0,0 +1,35 @@
+// INTENDED BEHAVIOR: no violation
+// explanation: can only replay once
+chan c = [8] of { byte };
+byte q=1;
+
+init {
+c!5;
+}
+
+active proctype consume() {
+MAIN:
+  do 
+  :: c ? 5 -> goto PROC1;
+  od
+PROC1:
+  do 
+  :: c ? 5 -> 
+    c!3;
+    goto PROC2;
+  od
+PROC2:
+  do 
+  :: c ? 3 -> goto PROC3;
+  od
+PROC3:
+  do 
+  :: c ? 3 -> goto PROC4;
+  od
+PROC4:
+  q=0;
+}
+
+ltl proc {
+  always !(q == 0);
+}