test-notify: fix fix for line continuation in long mail header lines
Continued lines can also start with space.
Note that this hack also incorrectly patches the diff output.
import: don't strip '#' lines from patch descriptions (issue 2417)
Previously no '# ' lines came through the parser.
Now only the first '# ' lines are processed, from '# HG changeset patch' and to
the first line not starting with '# '.