Merged r7650 from trunk

Merged r7650 from trunk

scm: mercurial: drop supporting below Mercurial 1.1

On November 1st 2011, Mercurial 2.0 will be released.

On Mercurial 1.1.2, unit lib test fails with following error.

<pre>
Traceback (most recent call last):
  File "/WEB-DOWN/hg-repo/hg-crew/hg", line 20, in <module>
    mercurial.dispatch.run()
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 20, in run
    sys.exit(dispatch(sys.argv[1:]))
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 29, in dispatch
    return _runcatch(u, args)
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 45, in _runcatch
    return _dispatch(ui, args)
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 367, in _dispatch
    ret = _runcommand(ui, options, cmd, d)
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 416, in _runcommand
    return checkargs()
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 376, in checkargs
    return cmdfunc()
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/dispatch.py", line 361, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/WEB-DOWN/hg-repo/hg-crew/mercurial/util.py", line 715, in check
    return func(*args, **kwargs)
  File "/REDMINE-1/hg-workdir/redmine-bb-all/lib/redmine/scm/adapters/mercurial/redminehelper.py", line 149, in rhlog
    if hg.util.version() >= '1.6':
AttributeError: 'module' object has no attribute 'version'

  1) Error:
test_nodes_in_branch(MercurialAdapterTest):
Redmine::Scm::Adapters::MercurialAdapter::HgCommandAborted: hg exited with non-zero status: 1
    lib/redmine/scm/adapters/mercurial_adapter.rb:306:in `hg'
    lib/redmine/scm/adapters/mercurial_adapter.rb:234:in `nodes_in_branch'
    test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb:311:in `test_nodes_in_branch'
    test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb:304:in `each'
    test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb:304:in `test_nodes_in_branch'
</pre>

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/1.2-stable@7651 e93f8b46-1217-0410-a6f0-8f06a7374b81