[tbot] Release 0.6.6

[Harald Seiler]

Hello!

New year, new tbot release! These are the changes:

== Added ==
- New and improved documentation!  There is a completely new
  introductory guide available here:

	https://rahix.de/tbot/quickstart.html

  It might even contain some new pieces of info, so I suggest
  taking a quick look, even if you already use tbot.
- Graphviz `dot` diagram generator, for visualizing the call
  graph.

	https://github.com/Rahix/tbot/blob/master/generators/dot.py

- `LinuxMachine.fsroot`: A little convenience helper:
  You can now write

	mach.fsroot / "proc" / "version"

  instead of

	linux.Path(mach, "/proc/version")

== Changed ==
- tbot no longer automatically creates a log file.  If you want
  the previous behavior, use `--log-auto`.  `--log=<file>` will
  still behave as before.

- `generators/generate_htmllog.py` -> `generators/htmllog.py`
- `generators/debug_messages.py` -> `generators/messages.py`
- `UBootMachine.env()` now also accepts `board.Special`s.

== Fixed ==
- Duplication warning when star-importing another testcase-file.
  (Thanks to Stefano for reporting this bug!)

-- 
Harald

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-62  Fax: +49-8142-66989-80   Email: hws at denx.de