[m-rev.] for review: Clarify licensing in READMEs.

[Peter Wang]

Say that the GPL terms apply to the compiler and tools, not to the
"implementation".  As stated right after, the libraries and runtime are
distributed under the terms of the LGPL.

Don't say Mercury is free software "but" it is copyrighted.
There's nothing strange about it.

Fix spelling ("licence" is a noun).

.README.in:
bindist/bindist.README:
	As above.

diff --git a/.README.in b/.README.in
index 9e9be03..3099a62 100644
--- a/.README.in
+++ b/.README.in
@@ -1,17 +1,18 @@
 This directory contains the source distribution for the University of Melbourne
 Mercury compiler, version @VERSION at .
 
-	The Mercury implementation is free software, but it is Copyright
-	(C) 1993-2013 The University of Melbourne.  It is distributed
-	under the terms of the GNU General Public License.  See the file
-	COPYING for copying permission.
+	The Mercury implementation is free software.
+	It is Copyright (C) 1993-2013 The University of Melbourne.
+
+	The compiler and tools are distributed under the terms of the GNU
+	General Public License.  See the file COPYING for copying permission.
 
 	The Mercury libraries and runtime (the files in the library, trace,
 	browser, ssdb, mdbcomp and runtime subdirectories) are distributed
 	under the terms of the GNU Library General Public License.  See the
 	file COPYING.LIB for copying permissions for those files.
 
-	If those licencing arrangements are not satisfactory, please
+	If those licensing arrangements are not satisfactory, please
 	contact us!  We are willing to offer alternative arrangements,
 	if the need should arise.
 	
diff --git a/bindist/bindist.README b/bindist/bindist.README
index 954afad..30e81aa 100644
--- a/bindist/bindist.README
+++ b/bindist/bindist.README
@@ -1,17 +1,19 @@
 This directory contains a binary distribution of the University of Melbourne
 Mercury compiler, version <VERSION>, built on a `<FULLARCH>' system.
 
-	The Mercury implementation is free software, but it is Copyright
-	(C) 1993-2013 The University of Melbourne.  It is distributed
-	under the terms of the GNU General Public License.  See the file
-	COPYING for copying permission.
+	The Mercury implementation is free software.
+	It is Copyright (C) 1993-2013 The University of Melbourne.
+
+	The compiler and tools are distributed under the terms of the GNU
+	General Public License.  See the file COPYING for copying permission.
 
 	The Mercury libraries and runtime (libmer_browser.*, libmer_std.*,
 	libmer_eventspec.*, libmer_trace.*, libmer_ssdb.*, libmer_mdbcomp.*,
 	libmer_rt.*) are distributed under the terms of the GNU Library
 	General Public License.  See the file COPYING.LIB for copying
-	permissions for those files.  
-	If those licencing arrangements are not satisfactory, please
+	permissions for those files.
+
+	If those licensing arrangements are not satisfactory, please
 	contact us!  We are willing to offer alternative arrangements,
 	if the need should arise.