Unit Printing Hook for Subclasses & Test

[seandenigris]

Gives more flexibility where the domain needs it e.g.

| unit measure |

unit := DummyDollarUnit named: 'dollar'.
measure := Measure amount: 5 unit: unit.
self assert: measure printString equals: '$5.00'.

[coveralls]

Pull Request Test Coverage Report for Build 81

• 21 of 21 (100.0%) changed or added relevant lines in 4 files are covered.
• 28 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.3%) to 92.525%

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Files with Coverage Reduction	New Missed Lines	%
source/Aconcagua-Core/Evaluation.class.st	4	38.29%
source/Aconcagua-Tests/MeasureBagTest.class.st	4	92.08%
source/Aconcagua-Core/InvalidUnaryOperationException.class.st	8	70.37%
source/Aconcagua-Core/InvalidBinaryOperationException.class.st	12	63.64%
<!--	Total:	28		-->

Totals
Change from base Build 78:	-0.3%
Covered Lines:	8318
Relevant Lines:	8990

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💛 - Coveralls

[gcotelli]

LGTM!