Feature/issue 782 simplify units. Fixes #782.

.gitignore

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+gistUnitsMagnitudes-PROTEGE.ttl

docs/release_notes/Issue-782.md

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+### Major Updates
+- CoherentUnit / StandardUnit
+  - Renamed CoherentUnit to StandardUnit with altLabel as CoherentUnit
+  - Changed formal definition to be equivalent to a UnitOfMeasure that
+    - has conversion=1
+    - has itself as a standard unit
+    - has a scopeNote indicating that this captures the idea of dimensiona UnitOfMeasure with itself as a standerd unit and conversion of 1.
+  - Made hasStandardUnit functional
+- UnitOfMeasure
+  -  made equivalent to a Magnitude that
+    - has numericValue =1 (it's not called 'unit' for nothing)
+    - has itself at its unit of measure
+    - has conversion=1
+    - has a standard unit
+  - removed UnitOfMeasuree from disjoints where incorrect or redundant
+
+- Removed product and ratio units and magnitudes
+  - Removed: ProductUnit, CoherentProductUnit, ProductMagnitude
+  - Removed: RatioUnit, CoherentRatioUnit, RatioMagnitude
+  - Percentage was redefined because it had been a subclass of RatioMagnitude which was defined in terms of RationUnit. The old definitions are inserted as blank nodes to retain same formal meaning.
+
+- Aspect
+  - Make Aspect a not a subclass of Category.  Aspects such as like length, or inner diameter or cycle time do not exist for the purpose of categorizing things.
+  - Make Aspect a subclass of SchemaMetaData. An aspect is a representation of a property connecting two things. It has roughly the same meaning as an OWL property.
+
+- Renamed Extent to Distance for consistency with DistanceUnit
+- Renamed MolarQuantity to MoleQuantity and CountingUnit to CountUnit for consistency
+- Renamed InformationQuantity to DataSize for naming consistency
+
+### Minor Updates
+- Moved an annotation about units from Magnitude to a better home: UnitOfMeasure
+- Fixed an erroneous definition of Magnitude and added examples
+- Added scopeNote for hasPrecision to say the precision of a Magnitude must have the same StandardUnit as the Magnitude.
+- Removed and deprecated SimpleUnitOfMeasure
+- Removed and deprecated hasBaseUnit. Use hasStandardUnit instead.
+- Removed redundant typing of BaseUnits, can be inferred from enumeration.
+- Added square meter and cubic meter as standard units for Area and Volume units respectively.
+- Made cubic_meter and square_meter explicit instances of just UnitOfMeasure instead of VolumeUnit and AreaUnit, respectively.
+- AreaUnit is now equivalent to UnitOfMeasure with standard unit of square meter, no longer requiring multipier/multiplicand
+- VolumeUnit is now equivalent to UnitOfMeasure with standard unit of cubic meter, no longer requiring multipier/multiplicand
+- Made non-standard units (e.g. minute) explicit instances of UnitOfMeasure rather than of the more specifit class, (e..g DurationUnit)
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