Fix up .gitignore file which had trailing space and win paths.
Update for branch use by removing SD card stuff and including latest TODO items.
Removed SD Card schematic sheet and all references to it on CPU and Power Supplies sheet. Updated page numbering and revision number on all sheets to suit drop of SD Card sheet and revision change to 0.1-alpha-RC1. Annotated all schematics and updated references to parts to match. Updated PDF also to reflect changes.