Recode non-ASCII characters in source to UTF-8

For consistency, have all non-ASCII characters from contributors'
names in the source be in UTF-8.  But remove some other more
gratuitous uses of non-ASCII characters.

contrib/README

@@ -95,7 +95,7 @@ intarray -
 
 isn -
 	PostgreSQL type extensions for ISBN, ISSN, ISMN, EAN13 product numbers
-	by Germn Mndez Bravo (Kronuz) <kronuz@hotmail.com>
+	by Germán Méndez Bravo (Kronuz) <kronuz@hotmail.com>
 
 lo -
 	Large Object maintenance

contrib/spi/timetravel.c

@@ -5,7 +5,7 @@
  * timetravel.c --	function to get time travel feature
  *		using general triggers.
  *
- * Modified by BJTHE Zoltn, Hungary, mailto:urdesobt@axelero.hu
+ * Modified by BÖJTHE Zoltán, Hungary, mailto:urdesobt@axelero.hu
  */
 #include "postgres.h"
 

src/backend/port/dynloader/darwin.c

@@ -48,7 +48,7 @@ pg_dlerror(void)
 /*
  * These routines were taken from the Apache source, but were made
  * available with a PostgreSQL-compatible license.	Kudos Wilfredo
- * Snchez <wsanchez@apple.com>.
+ * Sánchez <wsanchez@apple.com>.
  */
 
 static NSObjectFileImageReturnCode cofiff_result = NSObjectFileImageFailure;

src/backend/storage/lmgr/README-SSI

@@ -19,9 +19,9 @@ Jeff Davis.  It is based on work published in these papers:
 
 	Michael J. Cahill, Uwe Röhm, and Alan D. Fekete. 2008.
 	Serializable isolation for snapshot databases.
-	In SIGMOD ’08: Proceedings of the 2008 ACM SIGMOD
+	In SIGMOD '08: Proceedings of the 2008 ACM SIGMOD
 	international conference on Management of data,
-	pages 729–738, New York, NY, USA. ACM.
+	pages 729-738, New York, NY, USA. ACM.
 	http://doi.acm.org/10.1145/1376616.1376690
 
 	Michael James Cahill. 2009.
@@ -576,7 +576,7 @@ Search for serial execution to find the relevant section.
 [2] http://db.cs.berkeley.edu/papers/fntdb07-architecture.pdf
 Joseph M. Hellerstein, Michael Stonebraker and James Hamilton. 2007.
 Architecture of a Database System. Foundations and Trends(R) in
-Databases Vol. 1, No. 2 (2007) 141–259.
+Databases Vol. 1, No. 2 (2007) 141-259.
   Of particular interest:
     * 6.1 A Note on ACID
     * 6.2 A Brief Review of Serializability

src/backend/storage/lmgr/predicate.c

@@ -10,9 +10,9 @@
  *
  *	Michael J. Cahill, Uwe Röhm, and Alan D. Fekete. 2008.
  *	Serializable isolation for snapshot databases.
- *	In SIGMOD ’08: Proceedings of the 2008 ACM SIGMOD
+ *	In SIGMOD '08: Proceedings of the 2008 ACM SIGMOD
  *	international conference on Management of data,
- *	pages 729–738, New York, NY, USA. ACM.
+ *	pages 729-738, New York, NY, USA. ACM.
  *	http://doi.acm.org/10.1145/1376616.1376690
  *
  * and further elaborated in Cahill's doctoral thesis: