[stella] Removing the black line

["Gonzalo Fernández" <horcas@xxxxxxxxxxxxxxxxxx>]

Hello.

The updates are:
Implemented the 2 byte fractional technique "for better translation to
PAL" (but doesn't look too well).
Very tight counting in kernel. I removed a sta WSYNC! It works in the
emulator at least. I needed those cycles to update the NUSIZ1 register.
And the last thing is: no more black line in the left. Yes, the HMOVE
doesn't cause the little line. Not by triggering it every scanline, not by
using the playfield as a mask but doing the sta HMOVE just before the
scanline ends (not following the WSYNC as the big book says). The only
side-effect is to change the horizontalPos values. I don't know if any
game is doing it. To me it is very scary.

-- 
Gonzalo Fernández.

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