[dylan] OpenDylan 2012.1 released.

Dear Dylan Hacker,

It is a pleasure for us to finally announce a release of Open Dylan.

The last release with an announcement was 2011.1, in December, 2011. For a
variety of reasons, we didn't get to carry out our plan for
more frequent releases in 2012, but hope to have more frequent releases in
2013.

While we have extensive release notes [1], there are some important changes
that we feel are worth calling out separately:


   - We now use the C3 superclass linearization. See DEP-0003 [2] for more
   details.
   - Multithreading now works in the C backend.
   - Binaries and libraries built by dylan-compiler no longer have their
   directory location hard-coded within the executables.
   - dylan-compiler places output into a local _build directory and can
   read from a local registry rather than relying on global directories.
   - Many bugs have been fixed, especially involving the usage of floats.
   - Linux and FreeBSD 32 bit builds have been updated to a new version of
   the Memory Pool System GC which is much faster and stable.
   - A new strings library has been provided which replaces the old strings
   and string-extensions libraries with a more consistent and straightforward
   API. string-extensions has been removed.
   - The command-line-parser library has been cleaned up and
   integrated with the OpenDylan distribution.
   - We no longer provide PowerPC builds of OpenDylan on Mac OS X.
   Also, our Intel builds are for Mac OS X Lion and later. If you desire
   Snow Leopard support, please get in touch with us.


Please report problems that you have in our issue tracker:

  https://github.com/dylan-lang/opendylan/issues

You can get it from our website, http://opendylan.org/download/ .
On Windows there is an installer, on UNIX systems unpack into /opt. On 64
bit Linux, you will need to have the Boehm GC installed for our executables
to run. (Ubuntu: apt-get install libgc)

Good luck and happy Dylan hacking!

 - Bruce

[1] http://opendylan.org/documentation/release-notes/2012.1.html
[2] http://opendylan.org/proposals/dep-0003.html

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