Btest

* Additional control over TTY-based output handling This adds
-A|--show-all, which makes console output preserve output lines
for passing/skipped tests. (Christian Kreibich)

* Fix btest-rst-cmd script to remove tmp files. (Daniel Thayer)

* Added TMPDIR to btest.cfg so that temporary files are stored in a
local directory instead of a system-wide tmp directory. (Daniel
Thayer)

* Bugfix for recent btest-progress changes. (Robin Sommer)

* New utility btest-progress to display progress messages while a
test is executing. These messages appear in real-time while the
rest is still running. When stdout is a tty, the progress messages
are incorporated into the colored one-line status message. By
default, btest-progress also prints the message to a test's
standard output. That can be suppressed by giving it an option -q.
(Robin Sommer)

* Experimental automatic generation of test reference documentation.
The new command-line option "-R <format>" prints out a list of all
tests in either Markdown (format 'md') or reStructuredText (format
'rst'). The list includes a documentation string with each test
that gets defined through a new "TEST-DOC: <docstring>"
directive. This is experimental. (Robin Sommer)

* Fix pylint warnings. (Robin Sommer)

* Python 3 compatibility fixes for btest-sphinx.py. (Daniel Thayer)

* Fix diff-max-lines.test to work on openbsd. (Daniel Thayer)

* Fix the btest-rst-cmd script to work with Python 3. (Daniel
Thayer)