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!

so these macros probably shouldn't be used like that at all. So, this
change removes the misleading comment and also adds an implicit trailing
semi-colon to the DECLARE macros so they too don't require one.

will probably be more when the lh_doall[_arg] callbacks are similarly
tidied up, but this 'pod' should now be current.

cases of function pointer casting in lh_new() calls - and leave only the
lh_doall and lh_doall_arg cases to be finished.

might overflow.

be used as the hash/compare callbacks without function pointer casting.

For now, this is just happening in the apps/ directory whilst a few people
check the approach. The rest of the library will be moved across to the
same idea if there's no problems with this.

IMPLEMENT macros for defining wrapper functions for "hash" and "cmp" callbacks
that are specific to the underlying item type in a hash-table. This prevents
function pointer casting altogether, and also provides some type-safety
because the macro does per-variable casting from the (void *) type used in
LHASH itself to the type declared in the macro - and if that doesn't match the
prototype expected by the "hash" or "cmp" function then a compiler error will
result.

NB: IMPLEMENT macros are not required unless predeclared forms are required
(either in a header file, or further up in a C file than the implementation
needs to be). The DECLARE macros must occur after the type-specific hash/cmp
callbacks are declared. Also, the IMPLEMENT and DECLARE macros are such that
they can be prefixed with "static" if desired and a trailing semi-colon should
be appended (making it look more like a regular declaration and easier on
auto-formatting text-editors too).

Now that these macros are defined, I will next be commiting changes to a
number of places in the library where the casting was doing bad things. After
that, the final step will be to make the analogous changes for the lh_doall
and lh_doall_arg functions (more specifically, their callback parameters).

                if (bp == NULL)
                        for (j=0; j<10000; j++)
                                BN_add(&c,&a,&b);

seem to be pretty useless, and bp never is NULL anyway.

The *_part_words functions are not static.

The bn_cmp_part_words bug was only caught in the BN_mod_mul() test,
not in the BN_mul() test, so apparently the choice of parameters in
some cases is bad.