subs: use make_matrix_or_array and use 2-d indexing

[cbm755]

Fixes Issue #1226. Related to Issue #1222.

This makes test @sym/and, or, etc pass.

[alexvong243f]

I don't see any problems. Perhaps it's possible to simplify things a bit in @sym/subs but I don't know how to do it right now.

Anyway, the

syms x
e = (x == 3) & (x^2 == 9)
subs(e, x, [-3 0 3])

test case passes, so it's good to merge.