verify: rename "hasmanifest" variable for source code readability

verify: rename "hasmanifest" variable for source code readability

Before this patch, there are two ambiguous variables: "havemf" and
"hasmanifest".

"havemf" means whether there are any "manifest" entries.

"hasmanifest" means whether there are any "changelog" entries
referring to "manifest" entry.

This patch renames from "hasmanifest" to "refersmf" to clear
difference from "havemf".

--- a/mercurial/verify.py	Thu Oct 04 01:24:05 2012 +0900
+++ b/mercurial/verify.py	Thu Oct 04 01:24:05 2012 +0900
@@ -120,7 +120,7 @@
     havemf = len(mf) > 0
 
     ui.status(_("checking changesets\n"))
-    hasmanifest = False
+    refersmf = False
     seen = {}
     checklog(cl, "changelog", 0)
     total = len(repo)
@@ -133,17 +133,17 @@
             changes = cl.read(n)
             if changes[0] != nullid:
                 mflinkrevs.setdefault(changes[0], []).append(i)
-                hasmanifest = True
+                refersmf = True
             for f in changes[3]:
                 filelinkrevs.setdefault(f, []).append(i)
         except Exception, inst:
-            hasmanifest = True
+            refersmf = True
             exc(i, _("unpacking changeset %s") % short(n), inst)
     ui.progress(_('checking'), None)
 
     ui.status(_("checking manifests\n"))
     seen = {}
-    if hasmanifest:
+    if refersmf:
         # Do not check manifest if there are only changelog entries with
         # null manifests.
         checklog(mf, "manifest", 0)