+1.2.9 2011-08-28 Fixed a bug in glkop.c dispatching, to do with optional
+ array arguments, following a similar fix in Glulxe.
+ Glk array and string operations are now checked for memory
+ overflows (though not for ROM writing), following a similar
+ fix in Glulxe.
+
+1.2.8 2010-08-25 Fixed a problem with 'undo' when compiled as 64 bit,
+ contributed by Ben Cressey.
+ Fixed a sign problem for the @fceil opcode, following a
+ similar fix in Glulxe.
+
+1.2.7 2010-08-20 Floating point opcode support (VM spec 3.1.2).
+ Restart does not now discard undo information, so that a
+ restart can be undone.
+
+1.2.6 2010-02-09 Imported fix for retained Glk array handling from Glulxe.
+
+1.2.5 2009-11-21 Fixes for problems shown by Andrew Plotkin's glulxercise test
+ cases, from David Kinder.
+