[Calc.] Free42 v1.4.29

Free42 est une ré-implémentation de l’HP-42S et de l’imprimante HP-82240.

* Decimal version: did not handle numbers without mantissa correctly while
importing programs (i.e. lines like « E4 »; see the notes for version 1.3.5).
The binary version has handled this kind of thing correctly since version
1.3.5, but the decimal version did not. Fixed.