match: _globre doctests

match: improve documentation - docstrings and more descriptive variable naming No real changes. pattern: 'kind:pat' as specified on the command line patterns, pats: list of patterns kind: 'path', 'glob' or 're' or ... pat: string in the corresponding 'kind' format kindpats: list of (kind, pat) tuples

largefiles: changed overridelog to work with graphlog Log for largefiles was failing for graph log since it was overriding match instead of matchandpats. [Mads Kiilerich modified this patch to address his review comments and ended up rewriting/removing most of it.]