[FATTEN]

[FATTEN]
In a failed attempt at getting 7-zip to recognize the fat images,
* Updated the fatfs backing library to v0.11a,
* Changed the default cluster size to 1 for floppy-sized images (< 4096 sectors) and 8 otherwise (4096 was an invalid value), and
* Changed the fatfs formatting code to generate FAT12 filesystems more windows-like.
I see no reason to discard the changes, so here they are.

svn path=/trunk/; revision=69131