use GroupCount for package names in stats and add a package struct line

cmdline/apt-cache.cc

@@ -242,7 +242,9 @@ bool DumpPackage(CommandLine &CmdL)
 bool Stats(CommandLine &Cmd)
 {
    pkgCache &Cache = *GCache;
-   cout << _("Total package names: ") << Cache.Head().PackageCount << " (" <<
+   cout << _("Total package names: ") << Cache.Head().GroupCount << " (" <<
+      SizeToStr(Cache.Head().GroupCount*Cache.Head().GroupSz) << ')' << endl
+        << _("Total package structures: ") << Cache.Head().PackageCount << " (" <<
       SizeToStr(Cache.Head().PackageCount*Cache.Head().PackageSz) << ')' << endl;
 
    int Normal = 0;

debian/changelog

@@ -30,6 +30,7 @@ apt (0.7.26~exp4) experimental; urgency=low
   * cmdline/apt-cache.cc:
     - align Installed and Candidate Version in policy so they can be compared
       easier, thanks Ralf Gesellensetter for the pointer! (Closes: #578657)
+    - use GroupCount for package names in stats and add a package struct line
   * doc/apt.ent:
     - Add a note about APT_CONFIG in the -c description (Closes: #578267)
   * doc/po/de.po: