Make Unit.measure required (i.e., multiplicity 1 instead of 0..1)
Improve interpreted implementations of getUnitValue and newUnit
Add unit and measure tests for elementToPath and pathToElement
Fix handling of units in JavaPackageAndImportBuilder
In passing, improve failure reporting in AbstractCompiledStateIntegrityTest.testSpecializations and the package declaration patter in StringJavaSource.
Improvements to units and measures:
In passing, improve failure reporting in AbstractCompiledStateIntegrityTest.testSpecializations and the package declaration patter in StringJavaSource.