hgweb: pull cgitb into CGI script example, where it can easily be disabled

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hgweb: pull cgitb into CGI script example, where it can easily be disabled

This also eliminates cgitb dumps in the logging output of hg serve

manifest hash: a0aa07a706c2c388c0b49505e2960197f716920c
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hgweb.cgi

@@ -3,6 +3,8 b''
 # An example CGI script to use hgweb, edit as necessary
 
 import cgitb, os, sys
+cgitb.enable()
+
 # sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
 from mercurial import hgweb
 

mercurial/hgweb.py

@@ -6,10 +6,6 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-# useful for debugging
-import cgitb
-cgitb.enable()
-
 import os, cgi, time, re, difflib, sys, zlib
 from mercurial.hg import *
 from mercurial.ui import *