tests: ignore "undefined name 'memoryview'" pyflakes error on earlier Python Before this patch, "test-check-pyflakes.t" shows unexpected "undefined name 'memoryview'" error for "mercurial/util.py" on Python 2.6.x or earlier, because they don't define symbol 'memoryview'. This patch introduces excluding patterns into "filterpyflakes.py" to ignore "undefined name 'memoryview'" pyflakes error on Python 2.6.x or earlier

mq: eliminate unused variable for test-check-pyflakes.t "user" in "fold()" has become useless since 49148d7868df.

merge: make debug output slightly more helpful by including message for action Make recently introduced messages more useful. Instead of: f1: g f2: m say: f1: remote is newer -> g f2: versions differ -> m