Overlays again

We need to state some things clealyr regarding our overlay:

This is NOT a HP product

The HP16c mode in HP15c CE is Not Manufacturer-Supported. HP and its licensees are not responsible for its use and suitability for any application, and for the bugs that may exist in non-supported modes. The user is solely responsible for the operation in non-supported modes.

This overlay is intended just for exploration of the calculator features and not for professional purposes, and it is designed and produced by The Calculator Store SLNE. The company makes no representation for the accuracy of calculations in HP16 mode, in particular due to the DEC display bug.

Now working on:

• A firmware update that caters for the mos egregious bug in HP16c : the DEC bug. (I do not want to brag about it, but it was I who discovered it first). There are already candidates to solve the DEC bug - but not the others (very minor in comparison)
• A cable to perform firmware updates: the 3D design is made, we need now to perform mechanical tests, andf then submit to production
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