kernel32 (profile.c): allow profile section and key names of zero length patch

[Claudio Fontana]

Hello all,

I was wondering if there's anything wrong with my patch to
kernel32/profile.c and its tests:

http://www.winehq.org/pipermail/wine-patches/2007-February/035468.html

It fixes a problem that causes applications built with Multimedia
Fusion to fail under wine,
since the "INI object" of MF relies on zero length section and key
names to store and retrieve values.

The changes in tests/profile.c contain new testcases, and a generally
useful fix to the tests, where some values are currently passed
directly to the functions instead of using the values in the testcases
table.

If there's anything unclear or wrong about this patch, please tell me
so that I will be able to fix it.

Thanks,

Claudio