Some more proof generator tests
Merge branch 'master' of https://github.com/bfh-evg/unicrypt.git
Implemented PedersenCommitmentValidityProofGenerator and changed internal of set membership proof generators (f_proof = f_x o f'_x)
Implemented PedersenCommitmentValidityProofGenerator and changed internal of set membership proof generators (f_proof = f_x o f'_x)
Implemented PedersenCommitmentValidityProofGenerator and changed internal of set membership proof generators (f_proof = f_x o f'_x)