Evaluate the need for fixed-length floating point ypes

[LiamPack]

Related: #2

I expect this library to suffer in performance since the underlying type of the system is a plain-old-vector. Since this is a dynamic container, normal operations are going to suffer. Scrubbing around, I know that the Lyonesse library uses fixed-length floating point types for its matrix representations so that might be worthwhile to look into.