Make DOH more friendly to other AMD loaders:
    - specify baseUrl explicitly
    - specify mapping from doh --> util/doh explicitly
    - don't depend on mapping from doh to doh/main
    - use tlmSiblingOfDojo to make things still work with dojo

... but doesn't work yet, it looks one level too high for dijit stuff
given the URL http://localhost/trunk/util/doh/runner.html?testModule=dijit/tests/module