Preserve bandwidth in ConcreteMultiplication to BandedMatrix conversion
#358
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Currently, multiplying a
BandedMatrixby a scalar doesn't necessarily preserve its bandwidth, which implies that looping over the bands might lead to out-of-bounds access. This PR ensures that the bandwidths are preserved in scalar multiplication.Also, remove the
valJlogic, as aRecurrenceis aTridiagonalOperator, and is certain to have three bands.