Fix option and configuration for 'extra_tag_file'

Option was documented but did not work correctly.

Github issue #51

Changes

@@ -1,5 +1,6 @@
 4.05_01 0000-00-00 Duncan Ferguson <duncan_ferguson@user.sf.net>
 - Failure to find the terminal binary should not be fatal
+- Fix processing of '--extra_tag_file' and its configuration item (Github issue #51)
 
 4.05 2015-11-28 Duncan Ferguson <duncan_ferguson@user.sf.net>
 - Change default key_quit from 'Control-q' to 'Alt-q' (Github issue #50)

lib/App/ClusterSSH/Config.pm

@@ -74,6 +74,7 @@ my %default_config = (
     sftp         => 'sftp',
     sftp_args    => "",
 
+    extra_tag_file           => '',
     extra_cluster_file       => '',
     external_cluster_command => '',
 
@@ -186,10 +187,8 @@ sub validate_args {
     # check the terminal has been found correctly
     # looking for the terminal should not be fatal
     if ( !-e $self->{terminal} ) {
-        eval {
-            $self->{terminal} = $self->find_binary( $self->{terminal} );
-        };
-        if($@) {
+        eval { $self->{terminal} = $self->find_binary( $self->{terminal} ); };
+        if ($@) {
             warn $@->message;
         }
     }

lib/App/ClusterSSH/Getopt.pm

@@ -646,6 +646,13 @@ If the external command is given a C<-L> option it should output a list of tags
     );
     output 'C<< extra_cluster_file = ~/clusters, $HOME/clus >>';
 
+    output '=item extra_tag_file = <null>';
+    output $self->loc(
+        q{Define an extra tag file in the format of [_1].  Multiple files can be specified, separated by commas.  Both ~ and $HOME are acceptable as a reference to the user's home directory, e.g.},
+        'F</etc/tags>'
+    );
+    output 'C<< extra_tag_file = ~/tags, $HOME/tags >>';
+
     output '=item key_addhost = Control-Shift-plus';
     output $self->loc(
         q{Default key sequence to open AddHost menu.  See [_1] for more information.},

t/15config.t

@@ -79,6 +79,7 @@ Readonly::Hash my %default_config => {
     sftp         => 'sftp',
     sftp_args    => "",
 
+    extra_tag_file           => "",
     extra_cluster_file       => "",
     external_cluster_command => '',
 
@@ -533,6 +534,7 @@ console_position=
 debug=0
 external_cluster_command=
 extra_cluster_file=
+extra_tag_file=
 history_height=10
 history_width=40
 key_addhost=Control-Shift-plus

t/15config.t.file3

@@ -5,6 +5,7 @@ command=
 comms=ssh
 console_position=
 extra_cluster_file=
+extra_tag_file=
 history_height=10
 history_width=40
 key_addhost=Control-Shift-plus