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ket1 .. ket2
return the value of range(ket1, ket2)
ie, return the superposition of ket1, ket1 + 1, ket1 + 2, ... , ket2
we do our best to preserve categories
if you require step size other than 1, then you need to use the range(start, stop, step) function
note, the result is a superposition, not a sequence
if you require a sequence, either use sp2seq or srange()
if the kets are 2D then return a corresponding 2D patch
if ket2 is less than ket1, return the empty ket

-- a simple range:
|2> .. |7>
    |2> + |3> + |4> + |5> + |6> + |7>

-- a 2D range:
|0: 0> .. |2: 2>
    |0: 0> + |0: 1> + |0: 2> + |1: 0> + |1: 1> + |1: 2> + |2: 0> + |2: 1> + |2: 2>

-- making use of compile and range(), we can also define a range operator for kets:
range |*> #=> compile (|op: range> . |> . ssplit[" .. "] |_self>)

-- now apply it, without an explicit step:
range |3 .. 6>
    |3> + |4> + |5> + |6>

-- now apply it with an explicit step:
range |3 .. 5 .. 0.5>
    |3> + |3.5> + |4> + |4.5> + |5>