compute # insertions before replicating xtal structure; otherwise redundant

[coveralls]

Pull Request Test Coverage Report for Build 48

• 0 of 7 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 74.811%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/Henry.jl	0	7	0.0%
<!--	Total:	0	7	0.0%	-->

Totals
Change from base Build 46:	0.0%
Covered Lines:	989
Relevant Lines:	1322

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💛 - Coveralls