Add surplusLabel to Order

[fmrsabino]

• Adds the surplus property to a Fulfilled order.
• The surplus is computed with the absolute difference between the initial token amount and the executed amount of the order.

[coveralls]

Pull Request Test Coverage Report for Build 8649149663

Details

• 5 of 5 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 93.018%

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Files with Coverage Reduction	New Missed Lines	%
src/routes/transactions/entities/tests/human-description.builder.ts	1	90.0%

Totals
Change from base Build 8647415064:	0.05%
Covered Lines:	6763
Relevant Lines:	7016

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💛 - Coveralls