strip: access bookmark before getting a reference to changelog
Bookmark access might invalidate the current changelog (to make sure both are in
a reasonable synchronisation state). So we should grab the reference to
changelog after we access bookmark. Otherwise we risk using a dead object for
the whole strip process.
(note: this dead object business probably requires a new layers of checking)
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
http://docutils.sourceforge.net/rst.html
It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:
http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.