Adds ability to delete selections

[droglenc]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 16

• 17 of 102 (16.67%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.8%) to 35.783%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
R/RFishBC-internals.R	4	13	30.77%
R/findScalingFactor.R	0	11	0.0%
R/digitizeRadii.R	13	78	16.67%

Files with Coverage Reduction	New Missed Lines	%
R/RFishBC-internals.R	1	18.82%
R/showDigitizedImage.R	1	0.0%
R/findScalingFactor.R	1	0.0%

Totals
Change from base Build 11:	-0.8%
Covered Lines:	185
Relevant Lines:	517

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💛 - Coveralls