readme: mention how to run in-place
hgweb: fix typo in monoblue template
hgweb: fix capitalization in monoblue template
hgweb: avoid traceback when file or node parame...
hgweb: make paper:error consistent with template
hgweb: fix "branches" links in gitweb template
templater: handle a missing value correctly
util: replace util.nulldev with os.devnull