* Refactoring of build recipes, the file format has changed slightly: * The namespace URIs of recipe command collections are now abstract, implementations are registered using setuptools entry points. * Commands for report generation are no longer nested in a `<reports>` sub-element, but are at the same level as normal commands. * Fixed linking to files from the test results and code coverage summarizers. * Windows file separators are normalized to a forward slash by recipe commands (thereby also fixing linking to the repository browser from report summaries). * Paths using backslashes as file separators are now recognized in build logs in the web interface, and linked to the repository browser. * The `generator` column in the build log and report tables now has the qualified name of the recipe command that generated the log messages or report data. * There's a database upgrade script to fix file separator normalization and generator values for existing reports and build logs.