Separator bug removed and bottom space usage added.

[alpyre]

• mcc/EditorStuff.c: Corrected raster scrolling in accordance with bottom space usage.
• mcc/GetSetAttrs.c: Corrected line dump in accordance with bottom space usage.
• mcc/HandleInput.c: Implemented new behaviour for user clicks in the bottom space.
• mcc/Methods.c: Implemented new behaviour for user clicks in the bottom space.
• mcc/MixedFunctions.c: Better cursor drawing and drawbottom evaluations and tweaks for bottom space usage
• mcc/Navigation.c : Tweaks for bottom space usage.
• mcc/PrintLinesWithStyles.c: A bug in separator drawing removed. Better evaluation for partial line drawing in double buffer mode.

Removes issue #16