Create encryptiontestv2

Version and format included in header, added another method where each plaintext chunk is hashed, then that hash is transposed, appended to the SHA-512 stream transposed, hashed with SHA-512 again then used to XOR the next plaintext (first plaintext uses the SHA-512 of the salt as an IV). Previous files NOT compatible, although you can modify the header (just append 01 at the beginning).