apycot-moved #18810 link from message to file in hgweb [open]

when a message from a check concerns a specific file (or line of a file), link to the corresponding target in hgweb. For example the first message of pychecker at http://www.cubicweb.org/testexecution/489200?tab=pychecker could link to file cubicweb/rqlrewrite.py:278 as of changeset #3739:817e96eeac5c, which is http://hg.logilab.org/cubicweb/file/817e96eeac5c/rqlrewrite.py#l278

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