Inlined are a few more patches to 2.5.43 that fix problems that
were discovered during QA.

1-firm4.07 :: I've moved to the bottom since it's huge

Updates the firmware to 4.07. Fixes a bug introduced in 4.05 where
RTS is high after boot. Also fixes a bug where the whiteheat would
allow data reception after boot when no ports were open.

2-fix-dtr-rts

I didn't know this, but the firmware open command also handles
raising the signals for me. This code is superflous.

3-fix-read-urb

Read polling was started right away in whiteheat_open(). Coupled
with the firmware bug fixed above where data could be received
by a port that wasn't open, this caused the whiteheat_read_callback
to fire before open() was finished, and in some cases this caused
harm to the tty layer. I didn't track down the exact mechanism
because either moving the read polling to the last operation of open()
or using the fixed firmware caused the crash to stop happening. I
have stack traces if you'd like to have a look; it looks like something
scribbles on the stack, but I couldn't figure out what eactly, as the
scribbled data didn't match anything in the whiteheat driver or the
test applications.

4-fix-ixoff

RELEVANT_IFLAG masks off the software flow control bits, so that
a change that is restricted to the soft flow bits will be ignored. This
is the email I sent earlier; I've decided to just not use the macro for
now, but I'd still like to know if the macro should be fixed,.

..Stu