*Fixed bugs in ATAD and cleaned up code:
	1. Fixed ata_device_smart_get_status: This function was
	malfunctioning on some consoles with certain SPEED devices
	attached to them. The ATA registers are actually only 8-bits wide,
	and hence the upper 8 bits of the register should be filed off.
	2. Renamed ata_device_dma_transfer to ata_device_sector_io. Its
	original name was misleading as that function does sector I/O, but
	it doesn't have to involve DMA transfers at all to function.
	3. Updated some comments.
*Optimized the initialization code for the EE libfileXio library.
*Tweaked the EE-side LWIP v1.4.1 port for enhanced performance (Increased
TCP window size to 65535 and the number of PBUFs to 60).