Tests

Merge pull request #196 from LLFourn/check-share-is-part-of-session #827

Job	Run time
clippy_check	35s
Rustfmt	12s
doc-build	18s
build	2m 16s
test (x86_64-unknown-linux-gnu)	1m 38s
test-alloc (secp256kfun)	43s
test (armv7-unknown-linux-gnueabihf)	7m 2s
test-minimal (secp256kfun)	45s
test-alloc (sigma_fun)	22s
test-minimal (sigma_fun)	13s
test-alloc (ecdsa_fun)	39s
test-minimal (ecdsa_fun)	39s
test-nightly	1m 30s
test-alloc (schnorr_fun)	45s
test-minimal (schnorr_fun)	38s
	18m 15s

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