Updated EdDSA code

core/java/src/net/i2p/crypto/eddsa/Utils.java

core/java/src/net/i2p/crypto/eddsa/math/Curve.java

core/java/src/net/i2p/crypto/eddsa/math/Encoding.java

core/java/src/net/i2p/crypto/eddsa/math/Field.java

core/java/src/net/i2p/crypto/eddsa/math/FieldElement.java

core/java/src/net/i2p/crypto/eddsa/math/GroupElement.java

core/java/src/net/i2p/crypto/eddsa/math/ScalarOps.java

...pto/eddsa/math/bigint/BigIntegerLittleEndianEncoding.java

...et/i2p/crypto/eddsa/math/ed25519/Ed25519FieldElement.java

...rypto/eddsa/math/ed25519/Ed25519LittleEndianEncoding.java

...c/net/i2p/crypto/eddsa/math/ed25519/Ed25519ScalarOps.java