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Allow scalars and Arrays in FieldTuples #80

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Eg:

using CMBLensing, LinearAlgebra

f = FlatMap(rand(10,10))
ft = FieldTuple(;f, AL=1., r=0, Aϕ=[1,2])

ft2 = ft .+ ft # broadcasting works
ft3 = Diagonal(ft2) * ft # diagonal operators
ft3'ft3 # inner prod
(;f, AL) = ft2 # unpacking components

gradient(ft -> norm(Diagonal(ft)*ft), ft)[1] # gradients work

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