implement þ, outer product

[vendethiel]

@DennisMitchell do you want me to change the atom?

[DennisMitchell]

Yeah, I'm currently reserving the "funky" letters for niladic atoms, so quicks should use symbols. I think þ (table) is a good choice.

Regarding iterable, þ won't do much for one-element lists. iterable(..., make_range = True) might prove more useful.

[vendethiel]

$ ./jelly eu "×Þj€⁶j⁷" 10 10
1 2 3 4 5 6 7 8 9 10
2 4 6 8 10 12 14 16 18 20
3 6 9 12 15 18 21 24 27 30
4 8 12 16 20 24 28 32 36 40
5 10 15 20 25 30 35 40 45 50
6 12 18 24 30 36 42 48 54 60
7 14 21 28 35 42 49 56 63 70
8 16 24 32 40 48 56 64 72 80
9 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 100