[Libdlo] Draw fbX number on the green screen

[Alexander Todorov]

Hello all,
I'm experimenting with big number of USB attached screens and it's almost 
impossible to identify which screen corresponds to a particular /dev/fbX device 
number. This is especially true when all the monitors and the DisplayLink 
hardware is identical and works with the same resolution.

I've added extra functionality to my local udlfb branch to draw the string "fbX" 
where X is a number onto the green screen. After testing it today it seems to 
work quite well. I can contribute it back if people are interested.

I've added 2 helper functions to initialize the pixels which will show the fbX 
identifier and a .h file which contains image definitions. Those started off as 
graphics images (containing the 0-9 digits and the "f" and "b" characters) which 
were converted to XPM and later to an array containing 1 and 0.

There are 12 arrays which are 100x100 pixels full of ints and that takes up some 
space in memory. I'll work to compress the memory space while not obfuscating 
the source code.

Let me know if folks are interested and I'll send patches.

Regards,
Alexander.