store: add 'com0' and 'lpt0' doctest cases for _auxencode()
These are already covered by test-hybridencode.py, but they are so noteworthy
that I think they deserve being shown right in that doctest.
wireproto: fix check-code.py breakage introduced by
6d97dd630d79
record: fix display of non-ASCII names in chunk selection
b013baa3898e fixed display of non-ASCII names in file-selecting prompt, but
display in chunk selection remained broken. The reason is that using '%r' in
string formatting results in calling `repr` on file names, thus mangling
non-ASCII ones.
sshserver: avoid a multi-dot attribute lookup in a hot loop
This improves stream_out performance by about 3%.