progress: remove progress.estimate config

It was introduced by 98e4d39 ("progress: add speed format" 2011-5-9) and was
intended to hide ETA information for the first few seconds.

Later 5d261fd ("progress: add a changedelay to prevent parallel topics from
flapping (issue2698)" 2011-6-23) introduced `changedelay` config which hides
the entire progress bar for the first few seconds. So `progress.estimate` seems
somehow duplicated feature-wise. Since it's experimental and duplicated, let's
just remove it. This makes the next patch simpler - it no longer needs to make
sure `starttimes` is the real start time.

Differential Revision: https://phab.mercurial-scm.org/D828

mercurial/configitems.py

@@ -359,9 +359,6 b" coreconfigitem('progress', 'delay',"
 coreconfigitem('progress', 'disable',
     default=False,
 )
-coreconfigitem('progress', 'estimate',
-    default=2,
-)
 coreconfigitem('progress', 'refresh',
     default=0.1,
 )

mercurial/progress.py

@@ -215,9 +215,6 b' class progbar(object):'
         delta = pos - initialpos
         if delta > 0:
             elapsed = now - self.starttimes[topic]
-            # experimental config: progress.estimate
-            if elapsed > float(
-                self.ui.config('progress', 'estimate')):
                 seconds = (elapsed * (target - delta)) // delta + 1
                 return fmtremaining(seconds)
         return ''
@@ -226,8 +223,7 b' class progbar(object):'
         initialpos = self.startvals[topic]
         delta = pos - initialpos
         elapsed = now - self.starttimes[topic]
-        if elapsed > float(
-            self.ui.config('progress', 'estimate')):
+        if elapsed > 0:
             return _('%d %s/sec') % (delta / elapsed, unit)
         return ''