remove contrib/hgdiff, it makes refactoring diff/patch harder
it can always be revived if needed
demandimport: blacklist _ssl (
issue1964)
patch/diff: move patch.export() to cmdutil.export()
This API change will allow us to break a cycle between patch and cmdutil.
wix: pre-check the 'I approve this license' checkbox
This is simply a convenience to the user, they can click next until the
installer goes away. Optimally, the checkbox would be hidden or removed,
but that requires rewriting the UI.