Fix configuration location in Windows

At present, xmp client tries reading its config from/writing its config
to %SystemRoot% which is c:/windows or something:
http://en.wikipedia.org/wiki/Environment_variables#Microsoft_Windows
... and it is wrong and many times not allowed.  A better choice would
be using %USERPROFILE% instead, which is what I did today for mikmod.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update changelog and dates

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>