Plus42 algebraic expressions update

[Vincent Weber]

Hi Thomas,

Awesome job as usual ! Much more useful than the big stack IMHO Very well integrated, and the reordering is a nice addition.
You were right to start with the wonderful 27S, please go all the way with the powerful L() and G() functions, the ITEM() function to retrieve data from a list (or matrix ?). Making it a L-value to assign elements (impossible of the 27S) would be a big plus.
And of course, being able to call such equations from a RPN program would be awesome

Cheers,

Vincent