Perform all received* IrcMsg tagging in one spot.

This also fixes a long-standing failing Misc test since it was relying on the
receivedAt tag.

Signed-off-by: James McCoy <jamessan@users.sourceforge.net>

src/drivers/__init__.py

@@ -210,11 +210,9 @@ def newDriver(irc, moduleName=None):
     return driver
 
 def parseMsg(s):
-    start = time.time()
     s = s.strip()
     if s:
         msg = ircmsgs.IrcMsg(s)
-        msg.tag('receivedAt', start)
         return msg
     else:
         return None

src/irclib.py

@@ -777,6 +777,7 @@ class Irc(IrcCommandDispatcher):
         """Called by the IrcDriver; feeds a message received."""
         msg.tag('receivedBy', self)
         msg.tag('receivedOn', self.network)
+        msg.tag('receivedAt', time.time())
         if msg.args and self.isChannel(msg.args[0]):
             channel = msg.args[0]
         else: