Improvements to Shamir Secret Sharing to verify the integrity of shares issued by a central dealer.

Chelsea H. Komlo fed045bbe5 add verifying commitment		%!s(int64=6) %!d(string=hai) anos
src	fed045bbe5 add verifying commitment	%!s(int64=6) %!d(string=hai) anos
.gitignore	86643c7c22 Initial commit of empty cargo	%!s(int64=6) %!d(string=hai) anos
Cargo.toml	921ec26068 Sharing	%!s(int64=6) %!d(string=hai) anos