make default image width configurable

conf/default.php

@@ -3,3 +3,4 @@
 $conf['edit_content_only'] = 0;
 $conf['use_dataresolve'] = 1;
 $conf['rownumbers'] = 0;
+$conf['image_width'] = 40;

conf/metadata.php

@@ -3,3 +3,4 @@
 $meta['edit_content_only'] = array('onoff');
 $meta['use_dataresolve'] = array('onoff');;
 $meta['rownumbers'] = array('onoff');
+$meta['image_width'] = array('string');

helper.php

@@ -319,7 +319,7 @@ function _formatData($column, $value, Doku_Renderer_xhtml $R) {
                     if(substr($type, 0, 3) == 'img') {
                         $width = (int) substr($type, 3);
                         if(!$width) {
-                            $width = 40;
+                            $width = $this->getConf('image_width');
                         }
 
                         list($mediaid, $title) = explode('|', $val, 2);

lang/en/settings.php

@@ -5,3 +5,4 @@
 // https://github.com/splitbrain/dokuwiki-plugin-data/commit/8a16166886238906c21c7babc44bccf49c7f50a1
 $lang['use_dataresolve'] = 'Use DATARESOLVE calls for LIKE statements';
 $lang['rownumbers'] = 'Enable "rownumbers" by default in all tables';
+$lang['image_width'] = 'Default width for images';