help: Refine a bit the help text of "hg update" Parts of the original text were submitted by Hubert Kauker (Hubert dot Kauker at travelbasys.de). This is a slightly revised version of Hubert's original text.

add new test-hybridencode.py

statichttprepo: cleanups, use url.py (proxy, password support) - unify httprangereader.py and statichttprepo.py:rangegreader() - build the opener from url.py, that allows use to puse username and password in the url, to follow the proxy settings from hgrc, etc.