Merge from the ASN1 branch of new ASN1 code
to main trunk.

Lets see if the makes it to openssl-cvs :-)

One problem that looked like a problem in bn_recp.c at first turned
out to be a BN_mul bug.  An example is given in bn_recp.c; finding
the bug responsible for this is left as an exercise.

BN_mod_exp_mont does not work properly yet if modulus m
is negative (we want computations to be carried out
modulo |m|).

(just in cases someone uses a negative modulus)

it is missing.

"xxx tests passed" message.

stderr...

not just on certain platforms.

reliable timings yet, please try it out!

Spotted by plin <plin@rainbow.com>

add debug output facilities.

really undefined.
Spotted by Jeffrey Altman <jaltman@columbia.edu>

course, that means we need to handle the cases where the two arrays to
bn_mul_recursive() and bn_mul_part_recursive() differ in size.

I haven't yet changed the comments that describe bn_mul_recursive()
and bn_mul_part_recursive().  I want this to be tested by more people
before I consider this change final.  Please test away!