Mercurial auto-install package update

Please update the Mercurial auto-install package to 2.8.1. Thanks

Would it be possible to put a few paragraphs on the wiki with instructions on how to do this manually, given a python 2.7.x installation and a mercurial installation? Since mercurial has a new release essentially every month, having a list of instructions would allow us to update mercurial on the server without needing a new package each time.

I've pushed a new package with mercurial 3.0.0 and python 2.7.7 to the install wizard.

Here is how i build this package:

• build-win-hg-packages