Fixed several aspects of the GEOS CONIO implementation:

- cputc was drawing at the wrong position, therefore one line had to be removed as a workaround.
- chline, cvline were drawing one pixel to large lines.
- cclear was drawing an in both directions one pixel to big rect.
- the cursor was drawn at wrong times at wrong places in a wrong size.

git-svn-id: svn://svn.cc65.org/cc65/trunk@5874 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/geos-common/conio/cvline.s

@@ -25,7 +25,7 @@ _cvline:
 	tax
 	lda cursor_x		; x position
 	clc
-	adc #4			; in the middle of cell
+	adc #3			; in the middle of cell
 	sta r4L
 	lda cursor_x+1
 	adc #0
@@ -36,10 +36,12 @@ _cvline:
 	clc
 	adc cursor_r
 	sta cursor_r
+	asl a
+	asl a
+	asl a
+	clc			; one pixel less
+	sbc #0
 	sta r3H
-	asl r3H
-	asl r3H
-	asl r3H
 	lda #%11111111		; pattern
 	jsr VerticalLine
 	jsr fixcursor