progress: make progress.refresh=0 always display the progress line

This has no effect in real world where progress.refresh in unlikely to be set
to zero, but is very useful in tests where all progress output is to be traced.
It failed on platforms with coarse time.time() granularity, like Windows+py25.

hgext/progress.py

@@ -156,7 +156,8 b' class progbar(object):'
             if topic not in self.topics:
                 self.topics.append(topic)
             now = time.time()
-            if now - self.lastprint > self.refresh and topic == self.topics[-1]:
+            if (now - self.lastprint >= self.refresh
+                and topic == self.topics[-1]):
                 self.lastprint = now
                 self.show(topic, pos, item, unit, total)
         return orig(topic, pos, item=item, unit=unit, total=total)