Allow quoting of per-backup-point options

Use the parse_line function from Text::ParseWords when parsing
backup options.  This allows options to be quoted, which in turn
allows options to contain commas, which is needed for the mount
command used with LVM backups.

rsnapshot-program.pl

@@ -45,6 +45,7 @@
 use IO::File;                # recursive open in parse_config_file
 use IPC::Open3 qw(open3);    #open rsync with error output
 use IO::Handle;              # handle autoflush for rsync-output
+use Text::ParseWords;        # parse_line()
 
 ########################################
 ###           CPAN MODULES           ###
@@ -1770,7 +1771,7 @@ sub parse_backup_opts {
 	if (!$opts_str)          { return (undef); }
 
 	# split on commas first
-	@pairs = split(/,/, $opts_str);
+	@pairs = parse_line(',', 0, $opts_str);
 
 	# then loop through and split on equals
 	foreach my $pair (@pairs) {