Add `multiply`, `and_`, and `or_` about openfisca-tools HOT 3 CLOSED

Adding all but multiply_ - can we think of an example that wouldn't be covered by and_?

from openfisca-tools.

Not actual policy but something like this (suppose CB is means-tested so the amount is a variable rather than parameter):

total_child_benefit = multiply_(
    benunit,
    period,
    ["child_benefit_eligible", "number_of_children", "child_benefit_amount_per_child"]
)

from openfisca-tools.

OK, not sure that specific example works (number of children is probably group-level, amount per child probably person-level) but I've added multiply (as an alias of and_).

from openfisca-tools.