Tune default values in sample config file

--- ./rsnapshot.conf.default.in
+++ ./rsnapshot.conf.default.in
@@ -37,7 +37,7 @@ snapshot_root	/.snapshots/
 #
 # See the README file or the man page for more details.
 #
-#@CMD_CP@
+@CMD_CP@
 
 # uncomment this to use the rm program instead of the built-in perl routine.
 #
@@ -50,7 +50,7 @@ snapshot_root	/.snapshots/
 
 # Uncomment this to enable remote ssh backups over rsync.
 #
-#@CMD_SSH@
+@CMD_SSH@
 
 # Comment this out to disable syslog support.
 #
@@ -60,11 +60,11 @@ snapshot_root	/.snapshots/
 # If you have an older version of "du", you may also want to check the
 # "du_args" parameter below.
 #
-#@CMD_DU@
+@CMD_DU@
 
 # Uncomment this to specify the path to rsnapshot-diff.
 #
-#cmd_rsnapshot_diff	@prefix@/bin/rsnapshot-diff
+cmd_rsnapshot_diff	@prefix@/bin/rsnapshot-diff
 
 # Specify the path to a script (and any optional arguments) to run right
 # before rsnapshot syncs files
@@ -117,7 +117,7 @@ loglevel	3
 # If you enable this, data will be written to the file you specify. The
 # amount of data written is controlled by the "loglevel" parameter.
 #
-#logfile	/var/log/rsnapshot
+#logfile	/var/log/rsnapshot/rsnapshot.log
 
 # If enabled, rsnapshot will write a lockfile to prevent two instances
 # from running simultaneously (and messing up the snapshot_root).