[PATCH 1 of 5] localrepo: add some comment about role of various vfs object

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
# Date 1470397745 -7200
#      Fri Aug 05 13:49:05 2016 +0200
# Node ID b34202587b00d949dd77ff97399e50d6340779a6
# Parent  3f8f53190d6afed0aca6c6527236edad28ce785c
# EXP-Topic vfs.cleanup
localrepo: add some comment about role of various vfs object

This should make things clearer for most people.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -253,7 +253,12 @@ class localrepository(object):
 
     def __init__(self, baseui, path, create=False):
         self.requirements = set()
+        # vfs to access the working copy
         self.wvfs = scmutil.vfs(path, expandpath=True, realpath=True)
+        # vfs to access the content of the repository
+        self.vfs = None
+        # vfs to access the store part of the repository
+        self.svfs = None
         self.wopener = self.wvfs
         self.root = self.wvfs.base
         self.path = self.wvfs.join(".hg")