[m-rev.] for review: announce the change to core library licensing

[Julien Fischer]

For review bv anyone.

--------------------

Announce the change to the core library licensing.

NEWS:
    As above.

diff --git a/NEWS b/NEWS
index 73be100f0..aeb4164ef 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,21 @@
  NEWS since Mercury 14.01.x
  ==========================

+Changes to the core library license
+-----------------------------------
+
+* We have modified the terms under which the Mercury core libraries are
+  licensed by adding an exception to the requirements of clause 6 for
+  executable files linked against the Mercury core libraries.
+
+  See the file COPYING.LIB for the terms of the Mercury core library
+  license.
+
+  See the file LICENSE for licensing information in general.
+
+  The licensing of the compiler and other parts of the system has **not**
+  been changed.
+
  Changes that may break compatibility
  ------------------------------------