Revert "Fiddling with interrupts"

This reverts commit f08498e9f29b999b6c6d8a1f6913acb22fd87a12.
Revert "Fix SPI definitions"

This reverts commit 60ab1944fa2e4af24360a2f4911c3ea33d37aeff.
Revert "SPI bus working! How?"

This reverts commit 1b0d6c566b82e5a7192b88ab5284b86d52e29982.
Revert "Pull up MISO input pin"

This reverts commit 5ff6dbf25e097ad6445c8974c5b8bd1b315a5d47.
Revert "No joy fiddling"

This reverts commit 55dff4d66fbe869bb668754622046c932a38aad7.
Revert "Investigation SPI on JNu"

This reverts commit c956a490ccd5dd7815928c711efbff9a2f9fa358.
Revert "69 testing on JNu"

This reverts commit 90e885f20c9cc6af0b141472aa1b8e5a96438c63.