Learning from the mistakes of the first run of PCBs, here is the new layout.

• Added a reset pin
• Added a diode for the reset (marked as Schottky but can be germanium)
• Diode can be soldered in either direction for set or reset function (saving some room on the main board)
• Added a decoupling capacitor
• Added a proper connector (it's now a component in EAGLE so it can be reused to design the main board)
• The connector is keyed to prevent reverse/shifted insertion
• Fixed the drill diameters (the connector can be inserted with no force)
• Changed the pad shape to square for enhanced solderability by beginners
• Pinout compatible with v1
• Still no jumper
• Still 100% single-layer compatible and almost suitable for home etching
• Still fitting in a 25mm square

I've had to play a bit with placement, for example the resistors : they are quite thin so the current placement is not a problem.

I have no idea when I'll be able to afford another PCB run... yes I'm that broke.