Chapel 2.8 release announcement (#68)

[reviewed by @DanilaFe]

Author: bradcray

chpl-src/announcing-chapel-2.8.chpl

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+This announcement didn't end up using top-level code, but I wanted to
+keep it alongside the others for symmetry.
+
+(Specifically, it seemed weird to have one of the two debugging codes
+be testable and not the other; and I wasn't confident that I could
+inline the .good file for converter into the article in a clean way...
+though maybe I just didn't try hard enough?

chpl-src/announcing-chapel-2.8.notest

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+use IO;
+
+var s = new file(chpl_cstdout());
+var w = s.writer();
+
+w.writeln("Hello, world!");
+w.writeln(1, " ", 2.0, " three");
+
+record R {
+  var x : int;
+}
+
+// invokes Chapel's serialization framework
+var r = new R(5);
+w.writeln(r);

content/posts/announcing-chapel-2.8/LICM-kernel.png

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+--dyno --verify --no-checks --local

content/posts/announcing-chapel-2.8/LICM-toposort.png

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+Hello, world!
+1 2.0 three
+(x = 5)

content/posts/announcing-chapel-2.8/breakDistanceTo.png

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+CHPL_LLVM==none
+CHPL_NETWORK_ATOMICS!=none