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bookmark: take successors into account when updating (issue3561)

When we rewrite a bookmarked changeset, we want to update the
bookmark on its successors. But the successors are not descendants
of its precursor (by definition). This changeset alters the bookmarks
logic to update bookmark location if the newer location is a successor
of the old one[1].

note: valid destinations are in fact any kind of successors of any kind
      of descendants (recursively.)

This changeset requires the enabling of the obsolete feature in
some bookmark tests.

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.