Gabriel Ozouf 52dcd8e749 [poincare/unit] Restructure Unit ...

1. Information about a unit's dimension now uses inheritance.
   _m is an instance of DistanceAlias, which is derived from Alias.
   A UnitNode now keeps a pointer to an Alias and one to a Prefix.
   All aliases are still defined as constexpr.
   This cleans up a lot of the code used namely for computing the
   additional outputs in Calculation.

2. Instead of being defined with a string, each unit is described by its
   ratio with the base SI unit (ex: _L is 0.001 instead of "0.001_m^3").
   This greatly speeds up the calculations using units, as the algorithm
   to find the best unit used to parse the definition.

Change-Id: I4d6ed6ad4cb967026a3f01a335aec270066e2b9f

2020-11-04 15:11:45 +01:00

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