Added header file and disk-host-disk converters for ext2fs.
Added ext2fs superblock read and base library functions
Added syncer vnode ops and vfs ops.
Updated date
Added ext2 filesystem (read-only).
This shall be sufficient for testing the object module loader?

1. Initialize a floppy in Linux with ext2 filesystem:
    # sudo mkfs -t ext2 /dev/fd0

2. Mount the floppy disk in Linux:
    # sudo mount /dev/fd0 /mnt

3. Copy compiled object module e.g. the 'hello.o' file to floppy disk:
    # sudo cp ~/hello.o /mnt
    # sudo umount /mnt

4. Mount disk in Real VMX using commands:
    -> fdDrvInit 0x26, 0x06
    -> pFdDev=fdDevCreate(0, 0, 0, 0)
    -> xbdBlkDevCreate(pFdDev, "/fd0")
    -> cd "/fd0"
    -> ld < hello.o

5. Display module info with:
    -> moudleShow(0, 1)

6. Call main function e.g. 'int main(void)':
    -> main
Merge pull request #3 from baijkal/master

 Added ext2 file system (read-only) for testing loader.