Plus42 algebraic expressions update

[Thomas Okken]

I'll add keyboard and/or menu mappings for IF(, and various other functions, as I implement them. Work on the parser starts today...

Yep, ITEM() should support two-dimensional indexing. In addition, I'll add square bracket syntax, so instead of the familiar but cumbersome ITEM(A:1), you'll be able to write A[1]. And you should be able to apply it to matrices and to lists, and you should be able to provide a single index when indexing an Nx1 or 1xN matrix, i.e. treat it as a vector.