pyILPER Beta2 with HP-75 support

[jsi]

The keyboard mapping in pyILPER is table driven. You find them in the file pilkeymap.py. There is a table for the HP-71 and another for the HP-75 keyboard mapping. You could try to modify one of these tables but the file will be overwritten by the next software update or will change in further versions of the program.

At the moment I have no planning to support custom keyboard configurations because this requires users to properly configure the keyboard mapping both in pyILPER and on the calculator which might be tricky.