for review: changes to NEWS file

[Fergus Henderson]

Tyson Dowd <trd at cs.mu.oz.au> writes:

>You should mention the recent GRADEFLAGS change, since it is a user
>visible change.

Index: NEWS
===================================================================
RCS file: /home/mercury1/repository/mercury/NEWS,v
retrieving revision 1.87
diff -u -u -r1.87 NEWS
--- NEWS	1997/11/23 08:34:28	1.87
+++ NEWS	1997/11/23 15:03:10
@@ -244,3 +244,10 @@
 
 * We've updated to version 4.12 of the Boehm garbage collector.
 
+* Mmake has a new variable GRADEFLAGS for specifying options that
+  affect the grade (compilation model).
+
+  This means that for example to enable profiling, you can build with
+  `GRADEFLAGS = --profiling' in your Mmakefile, rather than having to
+  use the more obscure incantation `GRADE = asm_fast.gc.prof'.
+