fixed that branch numbering bug

lib/virtual/instruction.rb

@@ -76,14 +76,10 @@ module Virtual
   # this is an abstract base class (though no measures are taken to prevent instantiation) and derived
   # class names indicate the actual test
   class Branch < Instruction
-    @@counter = 1   #naming the braches by counting mainly to get them back together in testing
-    # TODO, while above sounds ok at first, it messes up with different test order fails etc, as the counter will 
-    # be different. Need a better way to create a unique but repeatable name
     def initialize name , nex = nil , other = nil
       super(nex)
       unless(name.to_s.split("_").last.to_i > 0)
-        name = "#{name}_#{@@counter}".to_sym 
-        @@counter += 1
+        name = "#{name}_#{name.to_i(36) % 65536}".to_sym 
       end
       @name = name
       @other = other