WP 34S and 31S bugs and fixes

[Nigel (UK)]

My opinions:

Case 1: produce an error message saying "Too small".

Case 2: allow the exponent so long as the number is less than 1e385; if it isn't, produce an error message saying "Too big".

Case 3: allow the exponent so long as the number isn't smaller than 1e-383; if it is smaller, give the "Too small" error message.

Case 4: same as Case 3 - i.e., allow any entry that leads to a number no smaller than 1e-383, and give an error message for other entries.

I think that it is best to decide whether the number is allowed only after it has been entered. I accept that this isn't entirely consistent with what is in the manual, but it is consistent and is unlikely to cause problems. People should not expect numbers outside of the allowed range to be accepted; giving an error message is the clearest way to show them that there is a problem.

Nigel (UK)