fixed mounting hole positions
fixed some tolerances in the PCB layer
major revision of the seating layer

major revision of the seating layer (layer below PCB) including resizing
of SD card slot, and simplifying of outlines. also added a second brace
across the center at the left mounting hole.
extended i/o ports up one layer

extended the holes for ethernet, audio out, and composite video out up
one layer for clearance
revised the HDMI port opening
merged ethernet outline with slot
changed holes to nut insets in base layer
gave smd cap more clearance in layer 4
widened HDMI port and shortened by 1 layer
connected front of net jack on its top layer
corrected hdmi jack hole
widened SD card slot