passing errors back to the user & knowing when received the final response

Hi

Currently if there is an error during processing the at
response the
user is left waiting in many cases.

This patch ensures the user always receives a response for a
given request.

The patch introduces a free list for a small tune-able
number of ucmd
(gsmd_msg_hdr) headers that can be used to relay back errors
to the
user, including no memory conditions.

These changes also ensures the client knows when it has
received the
final response for the particular request.

This patch supersedes the single confirm patch
http://lists.openmoko.org/pipermail/gsmd-
devel/2007-October/000280.html


Best regards,
Jim

Forgot to include that the patch was diffed against openmoko
svn 3350