Whitespace cleanup

* remove trailing whitespace
* remove empty lines at the end of files

plugins/postgresql/postgres_block_read_

@@ -28,8 +28,8 @@
 #       This should, however, be given through autoconf and suggest.
 #
 #       If required, give username, password and/or Postgresql server
-#       host through environment variables. 
-# 
+#       host through environment variables.
+#
 #       You must also activate Postgresql statistics. See
 #       http://www.postgresql.org/docs/7.4/interactive/monitoring-stats.html
 #       for how to enable this. Specifically, the following lines must
@@ -46,11 +46,11 @@
 # Config variables:
 #
 #       dbhost     - Which database server to use. Defaults to
-#                    'localhost'. 
+#                    'localhost'.
 #       dbuser     - A Postgresql user account with read permission to
 #                    the given database. Defaults to
 #                    'postgres'. Anyway, Munin must be told which user
-#                    this plugin should be run as. 
+#                    this plugin should be run as.
 #       dbpass     - The corresponding password, if
 #                    applicable. Default to undef. Remember that
 #                    pg_hba.conf must be configured accordingly.
@@ -128,7 +128,7 @@ if ($configure) {
 graph_title Postgres data reads from $dbname
 graph_args --base 1000
 graph_vlabel Blocks read per \${graph_period}
-graph_category db 
+graph_category db
 graph_info Shows number of blocks read from disk and from memory
 from_disk.label Read from disk
 from_disk.info Read from disk