We *are* now using auto GUIDs. It worked for a 5.2.3 -> 5.3.0-beta2
upgrade install. I suspect that specifying 'MajorUpgrade' means the
GUIDs mostly don't even matter. They're there for if you try to patch
so as to patch the correct files?
* Changed config version to 5.3.0-beta2 to be sure during testing.
* Fixed the case on ChangeLog.md in setup.py py2exe config.
* Replaced all TABs with <4 spaces> in wix/template.wxs.
* Now generating the correct Feature tree in the output file. NB: The
'RegistryEntries' isn't part of the file Components but still needs to
be referenced inside <Feature>.
Also renamed header.wxs to template.wxs in setup.py, as we're going to
insert into the middle of its content, not use it as a simple
concatenated header.
