Merge branch 'master' into search-parent-dirs

* master:
  Fixed markdown errors in README - code samples now correctly formatted.
  Fix use of config.sh in example
  log.py, minimal/do: don't use ansi colour codes if $TERM is blank or 'dumb'
  Use named constants for terminal control codes.
  redo-sh: keep testing even after finding a 'good' shell.
  redo-sh.do: hide warning output from 'which' in some shells.
  redo-sh.do: wrap long lines.
  Handle .do files that start with "#!/" to specify an explicit interpreter.
  minimal/do: don't print an error on exit if we don't build anything.
  bash completions: also mark 'do' as a completable command.
  bash completions: work correctly when $cur is an empty string.
  bash completions: call redo-targets for a more complete list.
  bash completions: work correctly with subdirs, ie. 'redo t/<tab>'
  Sample bash completion rules for redo targets.
  minimal/do: faster deletion of stamp files.
  minimal/do: delete .tmp files if a build fails.
  minimal/do: use ".did" stamp files instead of empty target files.
  minimal/do: use posix shell features instead of dirname/basename.
  Automatically select a good shell instead of relying on /bin/sh.

Conflicts:
	t/clean.do

t/.gitignore

@@ -15,3 +15,6 @@ test2.args
 /ifcreate[12].log
 /ifcreate[12].dep
 /ifcreate[12]
+/broken
+/shellfile
+/nonshelltest