py3: replace str.format(x) with `str % x` in githelp

githelp: drop the trailing period from single sentence output for consistency There are several instances of multiple sentence output, which I left alone. That is already nonstandard style, so dropping the period doesn't seem like an improvement.

hgweb: wrap {entries}* of filelog with mappinglist They were lists of mappings.

hgweb: don't use dict(key=value) to build a mapping dict in filelog It wasn't Py3 compatible because mapping keys must be bytes.

hgweb: wrap {diffopts} of annotate by hybriddict() The diffopts here is a plain dict, which should be wrapped by hybriddict.

hgweb: wrap {parents} of {annotate} with mappinggenerator It's a generator of at most two mappings, which has to be wrapped.

hgweb: wrap {annotate} with mappinggenerator No bare generator of mappings should be put in a template mapping.

hgweb: wrap {bookmarks} of summary with mappinggenerator No bare generator of mappings should be put in a template mapping.

hgweb: wrap {lastchange} of bookmarks with mappinglist It was an 1-length list of a mapping, can be wrapped with a mappinglist.

hgweb: wrap {entries}* of bookmarks with mappinggenerator They were functions returning a generator of mappings. The laziness is handled by the mappinggenerator class.