branching: merge with stable

tags: avoid expensive access to repo.changelog in a loop repo.changelog needs some cache invalidation when run on filtered repository. Accessing it in that loop can be expensive when there is many heads (e.g. mozilla try and it 25 000 heads). Note that the loop itself seems useless, but after this patch it no longer take about ⅛ of the time we spend computing cache for mozilla try. before : ! wall 0.350994 comb 0.350000 user 0.330000 sys 0.020000 (median of 28) after : ! wall 0.319520 comb 0.310000 user 0.290000 sys 0.020000 (median of 30)

blackbox: add a option to duplicate output to stderr too This is useful when debugging some performance operation.

perf: add a --update-last flag to perf::tags See inline documentation for details.

perf: add a `--clear-fnode-cache-rev` argument to perf::tags This will help us test this in situation closer to an update after a commit or a push.

perf: introduce more cache invalidation option in perf::tags This will help us to assert the performance of different versions in more diverse situations. We introduce helper function in the tags module in case invalidating such cache becomes different in the future.

hgweb: pass strings in WSGI environment correctly from wsgicgi According to PEP 3333, the strings in the WSGI environment must be translatable to bytes using the ISO-8859-1 codec.

branching: merge stable into default

Added signature for changeset 5a8b54201039

Added tag 6.5.2 for changeset 5a8b54201039