cabal: add bug-reports url
JWA: add missing PS384 and PSS value mappings
JWA: fix JWK RSA private key parsing

JWK private key parameters besides d are OPTIONAL, but if any are
given they must ALL be given (except "oth").  Therefore, shuffle
these off into a new type RSAPrivateKeyOptionalParameters and
replace them with

    optionalParameters :: Maybe RSAPrivateKeyOptionalParameters

in the RSAPrivateKeyParameters record constructor.
JWA: add the rest of the JWE "alg" values