Plus42 algebraic expressions update

[Vincent Weber]

Thanks Thomas.
Noted for the catalog and printing (I think that allowing shift PRINT to print the current equation should do the job - the whole equation list can be print using PRV "EQNS").
As for complex numbers, well, I'm not too sure on how they would blend easily with the solver, that's why I thought that the 27S-style was more appropriate. Besides, typing XCOORD is quite long...

By the way, any intention to implement (after equations of course) the list-based stats of the 27S ? Or playing with matrices in user code (like the programs in the 42S manual) should do the job ?

Cheers