Significant changes since 1.2.1:
* In addition to the scrypt command-line utility, a library "libscrypt-kdf"
can now be built and installed by passing the --enable-libscrypt-kdf option
to configure.
* On x86 CPUs which support them, RDRAND and SHA extensions are used to
provide supplemental entropy and speed up hash computations respectively.
* When estimating the amount of available RAM, scrypt ignores RLIMIT_DATA on
systems which have mmap.
* A new command "scrypt info encfile" prints information about an encrypted
file without decrypting it.
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