py3: use print_function in test-bdiff.py

py3: use absolute_import in test-bdiff.py

py3: use print_function in test-batching.py

py3: use absolute_import in test-batching.py

py3: use print_function in silenttestrunner.py

py3: use absolute_import in silenttestrunner.py

py3: use print_function in hypothesishelpers.py

tests: use absolute_import in hypothesishelpers.py

py3: use print_function in get-with-headers.py

py3: use print_function in generate-working-copy-states.py

py3: use print_function in filterpyflakes.py

py3: use print_function in test-ancestor.py

py3: use print_function in seq.py

py3: use absolute_import in seq.py

parser: move parsererrordetail() function from revset module This will be used by common alias functions introduced by future patches.

hgweb: fix links in atom-branches