cleanup: move stdlib imports to their own import statement

cleanup: move stdlib imports to their own import statement

There are a few warnings still produced by my import checker, but
those are false positives produced by modules that share a name with
stdlib modules.

--- a/mercurial/ancestor.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/ancestor.py	Wed Nov 06 16:48:06 2013 -0500
@@ -5,7 +5,8 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import heapq, util
+import heapq
+import util
 from node import nullrev
 
 def ancestors(pfunc, *orignodes):

--- a/mercurial/commands.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/commands.py	Wed Nov 06 16:48:06 2013 -0500
@@ -17,7 +17,8 @@
 import merge as mergemod
 import minirst, revset, fileset
 import dagparser, context, simplemerge, graphmod
-import random, setdiscovery, treediscovery, dagutil, pvec, localrepo
+import random
+import setdiscovery, treediscovery, dagutil, pvec, localrepo
 import phases, obsolete
 
 table = {}

--- a/mercurial/fancyopts.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/fancyopts.py	Wed Nov 06 16:48:06 2013 -0500
@@ -5,7 +5,8 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import getopt, util
+import getopt
+import util
 from i18n import _
 
 def gnugetopt(args, options, longoptions):

--- a/mercurial/fileset.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/fileset.py	Wed Nov 06 16:48:06 2013 -0500
@@ -5,7 +5,8 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import parser, error, util, merge, re
+import re
+import parser, error, util, merge
 from i18n import _
 
 elements = {

--- a/mercurial/hbisect.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/hbisect.py	Wed Nov 06 16:48:06 2013 -0500
@@ -8,7 +8,8 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import os, error
+import os
+import error
 from i18n import _
 from node import short, hex
 import util

--- a/mercurial/help.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/help.py	Wed Nov 06 16:48:06 2013 -0500
@@ -6,7 +6,8 @@
 # GNU General Public License version 2 or any later version.
 
 from i18n import gettext, _
-import itertools, sys, os, error
+import itertools, sys, os
+import error
 import extensions, revset, fileset, templatekw, templatefilters, filemerge
 import encoding, util, minirst
 import cmdutil

--- a/mercurial/hgweb/hgweb_mod.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/hgweb/hgweb_mod.py	Wed Nov 06 16:48:06 2013 -0500
@@ -6,7 +6,7 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import os
+import os, re
 from mercurial import ui, hg, hook, error, encoding, templater, util, repoview
 from mercurial.templatefilters import websub
 from mercurial.i18n import _
@@ -14,7 +14,7 @@
 from common import HTTP_OK, HTTP_NOT_MODIFIED, HTTP_BAD_REQUEST
 from common import HTTP_NOT_FOUND, HTTP_SERVER_ERROR
 from request import wsgirequest
-import webcommands, protocol, webutil, re
+import webcommands, protocol, webutil
 
 perms = {
     'changegroup': 'pull',

--- a/mercurial/mdiff.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/mdiff.py	Wed Nov 06 16:48:06 2013 -0500
@@ -6,8 +6,8 @@
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
-import bdiff, mpatch, util
-import re, struct, base85, zlib
+import bdiff, mpatch, util, base85
+import re, struct, zlib
 
 def splitnewlines(text):
     '''like str.splitlines, but only split on newlines.'''

--- a/mercurial/setdiscovery.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/setdiscovery.py	Wed Nov 06 16:48:06 2013 -0500
@@ -8,7 +8,8 @@
 
 from node import nullid
 from i18n import _
-import random, util, dagutil
+import random
+import util, dagutil
 
 def _updatesample(dag, nodes, sample, always, quicksamplesize=0):
     # if nodes is empty we scan the entire graph

--- a/mercurial/util.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/util.py	Wed Nov 06 16:48:06 2013 -0500
@@ -14,9 +14,9 @@
 """
 
 from i18n import _
-import error, osutil, encoding, collections
+import error, osutil, encoding
 import errno, re, shutil, sys, tempfile, traceback
-import os, time, datetime, calendar, textwrap, signal
+import os, time, datetime, calendar, textwrap, signal, collections
 import imp, socket, urllib
 
 if os.name == 'nt':

--- a/mercurial/worker.py	Wed Nov 06 18:19:04 2013 -0500
+++ b/mercurial/worker.py	Wed Nov 06 16:48:06 2013 -0500
@@ -6,7 +6,8 @@
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
-import errno, os, signal, sys, threading, util
+import errno, os, signal, sys, threading
+import util
 
 def countcpus():
     '''try to count the number of CPUs on the system'''