Started on NEWS entries for 3.1.

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+NEWS for the Nettle 3.1 release
+
+       This release adds a couple of new features.
+
+XXX    The shared library names???
+
+       Bug fixes:
+
+       * Eliminate out-of-bounds reads in the C implementation of
+         memxor (related to valgrind's --partial-loads-ok flag).
+
+       Interface changes:
+
+       * Declarations of many internal functions are moved from ecc.h
+         to ecc-internal.h. The functions are undocumented, and
+         luckily they're apparently also unused by applications, so I
+         don't expect any problems from this change.
+
+       New features:
+
+       * Support for curve25519 and for EdDSA25519 signatures.
+
+       * Support for "fat builds" on x86_64 and arm, where the
+         implementation of certain functions is selected at run-time
+         depending on available cpu features. Configure with
+         --enable-fat to try this out. If it turns out to work well
+         enough, it will likely be enabled by default in later
+         releases.
+
+       * Support for building the hogweed library (public key
+         support) using "mini-gmp", a small but slower implementation
+         of a subset of the GMP interfaces. Note that builds using
+         mini-gmp are *not* binary compatible with regular builds,
+         and more likely to leak side-channel information.
+
+         One intended usecase is for small embedded applications
+         which need to verify digital signatures.
+
+XXX    * The shared libraries are now built with versioned symbols.
+         Should reduce problems in case a program links explicitly
+         both to nettle and/or hogweed, and to gnutls, and the
+         program and gnutls expects different versions.
+
+       Optimizations:
+
+       * New x86_64 implementation of AES, using the "aesni"
+         instructions. Autodetected in fat builds. In non-fat builds,
+         it has to be enabled explicitly with --enable-x86-aesni.
+
+       Build system:
+
+       * Use the same object files for both static and shared
+         libraries. This eliminates the *.po object files which were
+         confusing to some tools (as well as humans). Like before,
+         PIC code is used by default; to build a non-pic static
+         library, configure with --disable-pic --disable-shared.
+
+       Miscellaneous:
+
+       * Made type-checking hack in CBC_ENCRYPT and similar macros
+         stricter, to generate warnings if they are used with
+         functions which have a length argument smaller than size_t.
+
 NEWS for the Nettle 3.0 release
 
        This is a major release, including several interface changes,