doc update

[Ralf Habacker]

Hi all, 
I have collected some informations from the mailing list and tried to make an 
initial documentation/spec for some parts of bksys using doxygen. 

I would like to get some more input to make this more ready and to see how  we 
can design the contributed ideas. 
Are there any problems, that I checkin a new doc dir containing the doxygen 
files and (optional) the html output into doc/html for reviewing ? 

Regards
Ralf