Fix compiling of n-ary operators (0 & 1 args), add operator aliases

n-ary operators with no arguments would break everything (compiling to "()").
This should no longer be the case. Additionally, unary operators (ie. negation)
now compile properly in the one arg case.

Operator aliases allow us to change how we refer to things like the "~" regex
operator in postgresql. At the moment it's aliased as "$".

Additionally: booleans now compile to upper case.

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