make borrowed bv constructors public #192

Job	Run time
Check Semantic Versioning	2m 33s
Check Minimum Rust Version	18s
Unit Tests (stable, default)	47s
Unit Tests (stable, bigint)	54s
Unit Tests (stable, serde1)	52s
Unit Tests (stable, fraction1)	55s
Unit Tests (stable, rand1)	52s
Unit Tests (stable, bigint,serde1,fraction1,rand1)	1m 0s
Unit Tests (beta, default)	41s
Unit Tests (beta, bigint)	48s
Unit Tests (beta, serde1)	49s
Unit Tests (beta, fraction1)	44s
Unit Tests (beta, rand1)	44s
Unit Tests (beta, bigint,serde1,fraction1,rand1)	57s
Unit Tests (nightly, default)	41s
Unit Tests (nightly, bigint)	48s
Unit Tests (nightly, serde1)	47s
Unit Tests (nightly, fraction1)	45s
Unit Tests (nightly, rand1)	44s
Unit Tests (nightly, bigint,serde1,fraction1,rand1)	57s
	17m 36s

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