Fix typos in some error messages thrown by extension scripts when fed to psql.

Some of the many error messages introduced in 458857cc missed 'FROM
unpackaged'. Also e016b724 and 45ffeb7e forgot to quote extension
version numbers.

Backpatch to 9.1, just like 458857cc which introduced the messages. Do
so because the error messages thrown when the wrong command is copy &
pasted aren't easy to understand.

contrib/spi/autoinc--unpackaged--1.0.sql

@@ -1,6 +1,6 @@
 /* contrib/spi/autoinc--unpackaged--1.0.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION autoinc" to load this file. \quit
+\echo Use "CREATE EXTENSION autoinc FROM unpackaged" to load this file. \quit
 
 ALTER EXTENSION autoinc ADD function autoinc();

contrib/spi/insert_username--unpackaged--1.0.sql

@@ -1,6 +1,6 @@
 /* contrib/spi/insert_username--unpackaged--1.0.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION insert_username" to load this file. \quit
+\echo Use "CREATE EXTENSION insert_username FROM unpackaged" to load this file. \quit
 
 ALTER EXTENSION insert_username ADD function insert_username();

contrib/spi/moddatetime--unpackaged--1.0.sql

@@ -1,6 +1,6 @@
 /* contrib/spi/moddatetime--unpackaged--1.0.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION moddatetime" to load this file. \quit
+\echo Use "CREATE EXTENSION moddatetime FROM unpackaged" to load this file. \quit
 
 ALTER EXTENSION moddatetime ADD function moddatetime();

contrib/spi/refint--unpackaged--1.0.sql

@@ -1,7 +1,7 @@
 /* contrib/spi/refint--unpackaged--1.0.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION refint" to load this file. \quit
+\echo Use "CREATE EXTENSION refint FROM unpackaged" to load this file. \quit
 
 ALTER EXTENSION refint ADD function check_primary_key();
 ALTER EXTENSION refint ADD function check_foreign_key();

contrib/spi/timetravel--unpackaged--1.0.sql

@@ -1,7 +1,7 @@
 /* contrib/spi/timetravel--unpackaged--1.0.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION timetravel" to load this file. \quit
+\echo Use "CREATE EXTENSION timetravel FROM unpackaged" to load this file. \quit
 
 ALTER EXTENSION timetravel ADD function timetravel();
 ALTER EXTENSION timetravel ADD function set_timetravel(name,integer);