Fix addremove for symlinks to non-existent files

Avoid some false positives for addremove -s The original code uses the similary score 1 - len(diff(after, before)) / len(after) The diff can at most be the size of the 'before' file, so any small 'before' file would be considered very similar. Removing an empty file would cause all files added in the same revision to be considered copies of the removed file. This changes the metric to bytes_overlap(before, after) / len(before + after) i.e. the actual percentage of bytes shared between the two files.

Merge with crew-stable

mq: abort cleanly when invalid patch name is given to qguard

Close keepalive connections to fix server traceback

don't return uninitialized memory from bdiff.blocks() bdiff.blocks() returns a dummy match at the end of both files; the length of that chunk is never set, so it will sometimes contain random heap garbage. There are apparently workarounds for this elsewhere: # bdiff sometimes gives huge matches past eof, this check eats them,

web/server: disable address reuse option for BaseHTTPServer on windows On windows, a socket with the SO_REUSEADDR option set is able to bind to any port, even if there's already an active socket listening on it. test-http: check server address cannot be reused.

stdout raises EINVAL when flush() is called on a closed pipe under win32. Maybe the exception should be caught and translated at raise location instead (sshserver.py).

localrepo: stream_in may raise ZeroDivisionError with nul float elapsed argument.

streamclone: stream_out tried to decodefilename non-normalized paths