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setup.py: install packagescan before any mercurial modules is imported

Further the installation of packagescan over demandload is moved to the
packagescan module.

I added as well few more comments in the packagescan module to avoid
the wrong use of package scan in the future.

Reason:

mercurial.packagescan acts as fake mercurial.demandload during a py2exe
run.  Unfortunatly the import of mercurial.version in setup.py is done
before mercurial.packagescan is installed. This results in few imports
without mercurial.packagescan in charge and therefore not all dependend
modules are detected when running mercurial.packagescan.getmodules
later e.g.  winerror is missed.

#!/usr/bin/env python
#
# An example CGI script to use hgweb, edit as necessary

import cgitb, os, sys
cgitb.enable()

# sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
from mercurial import hgweb

h = hgweb.hgweb("/path/to/repo", "repository name")
h.run()