split the defined_unit_string into a customary and si blocks #217
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as a first step to being able to partition the entire system in a strict SI vs all unit parser/generator. There will be a number of other steps before that point.
The next step will be to do something similar for the other direction including tests of the vector itself.
This PR splits the definitions into two components and removes a few duplicates and 1 overwritten symbol
Namely "D" for day was being interpreted as "Debye" (the cgs unit of electrical dipole moment) which is probably not that common.