KDE_ macros in kde_file.h

[Jaison Lee]

Fine. If there are reasons for this header then the REAL problem is
that it is not being used everywhere that it can be.

I'll try and change any occurrances of ::open, ::link, ::ftell,
::fseek, etc. to the KDE_ equivalents. At the very least, it will make
it easier to identify areas that are avoiding Qt mechanisms to work
with their io, and might help the mac/windows guys with porting.

I still think we are giving this header WAY too much visibility for
what it's doing. Outside of a VERY few classes in kdelibs I think
QFiles should be preferred over streams and handles in almost every
case. But, I bow to the masses.