[fastfat_new]

[fastfat_new]
- Open a file in FatiOpenExistingFile by means of FullFAT library.
- Fix incorrect fullfat placement in fasfat.rbuild.
- Hack StreamFileObject to be 5Gb in length instead of 512 bytes. It'll be set to the size of an underlying physical device later.
- Add FF file handle to FCB structure.

svn path=/trunk/; revision=43247