Display the plugin's description in the list of plugins instead of the plugin's filename

In the dialog, the plugin's description is more interesting and useful than the full filename.
Instead, show the filename in the bottom box for those interested in.

src/plugins.c

@@ -1104,7 +1104,7 @@ enum
 {
 	PLUGIN_COLUMN_CHECK = 0,
 	PLUGIN_COLUMN_NAME,
-	PLUGIN_COLUMN_FILE,
+	PLUGIN_COLUMN_DESCRIPTION,
 	PLUGIN_COLUMN_PLUGIN,
 	PLUGIN_N_COLUMNS,
 	PM_BUTTON_CONFIGURE,
@@ -1117,7 +1117,7 @@ typedef struct
 	GtkWidget *tree;
 	GtkListStore *store;
 	GtkWidget *plugin_label;
-	GtkWidget *description_label;
+	GtkWidget *filename_label;
 	GtkWidget *author_label;
 	GtkWidget *configure_button;
 	GtkWidget *help_button;
@@ -1157,7 +1157,7 @@ static void pm_selection_changed(GtkTreeSelection *selection, gpointer user_data
 			/* Translators: <plugin name> <plugin version> */
 			text = g_strdup_printf(_("%s %s"), pi->name, pi->version);
 			gtk_label_set_text(GTK_LABEL(pm_widgets.plugin_label), text);
-			gtk_label_set_text(GTK_LABEL(pm_widgets.description_label), pi->description);
+			gtk_label_set_text(GTK_LABEL(pm_widgets.filename_label), p->filename);
 			gtk_label_set_text(GTK_LABEL(pm_widgets.author_label), pi->author);
 			g_free(text);
 
@@ -1243,7 +1243,7 @@ static void pm_prepare_treeview(GtkWidget *tree, GtkListStore *store)
 	text_renderer = gtk_cell_renderer_text_new();
 	g_object_set(text_renderer, "ellipsize", PANGO_ELLIPSIZE_END, NULL);
 	column = gtk_tree_view_column_new_with_attributes(
-		_("File"), text_renderer, "text", PLUGIN_COLUMN_FILE, NULL);
+		_("Description"), text_renderer, "text", PLUGIN_COLUMN_DESCRIPTION, NULL);
 	gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column);
 
 	gtk_tree_view_set_rules_hint(GTK_TREE_VIEW(tree), TRUE);
@@ -1262,7 +1262,7 @@ static void pm_prepare_treeview(GtkWidget *tree, GtkListStore *store)
 		gtk_list_store_append(store, &iter);
 		gtk_list_store_set(store, &iter, PLUGIN_COLUMN_CHECK, FALSE,
 				PLUGIN_COLUMN_NAME, _("No plugins available."),
-				PLUGIN_COLUMN_FILE, "", PLUGIN_COLUMN_PLUGIN, NULL, -1);
+				PLUGIN_COLUMN_DESCRIPTION, "", PLUGIN_COLUMN_PLUGIN, NULL, -1);
 	}
 	else
 	{
@@ -1275,7 +1275,7 @@ static void pm_prepare_treeview(GtkWidget *tree, GtkListStore *store)
 			gtk_list_store_set(store, &iter,
 				PLUGIN_COLUMN_CHECK, is_active_plugin(p),
 				PLUGIN_COLUMN_NAME, p->info.name,
-				PLUGIN_COLUMN_FILE, p->filename,
+				PLUGIN_COLUMN_DESCRIPTION, p->info.description,
 				PLUGIN_COLUMN_PLUGIN, p,
 				-1);
 		}
@@ -1396,14 +1396,14 @@ static void pm_show_dialog(GtkMenuItem *menuitem, gpointer user_data)
 	table = gtk_table_new(3, 2, FALSE);
 	gtk_table_set_col_spacings(GTK_TABLE(table), 6);
 	pm_widgets.plugin_label = geany_wrap_label_new(NULL);
-	pm_widgets.description_label = geany_wrap_label_new(NULL);
+	pm_widgets.filename_label = geany_wrap_label_new(NULL);
 	pm_widgets.author_label = geany_wrap_label_new(NULL);
 	gtk_table_attach(GTK_TABLE(table), create_table_label(_("Plugin:")), 0, 1, 0, 1, GTK_FILL, GTK_FILL, 0, 0);
-	gtk_table_attach(GTK_TABLE(table), create_table_label(_("Description:")), 0, 1, 1, 2, GTK_FILL, GTK_FILL, 0, 0);
-	gtk_table_attach(GTK_TABLE(table), create_table_label(_("Author(s):")), 0, 1, 2, 3, GTK_FILL, GTK_FILL, 0, 0);
+	gtk_table_attach(GTK_TABLE(table), create_table_label(_("Author(s):")), 0, 1, 1, 2, GTK_FILL, GTK_FILL, 0, 0);
+	gtk_table_attach(GTK_TABLE(table), create_table_label(_("Filename:")), 0, 1, 2, 3, GTK_FILL, GTK_FILL, 0, 0);
 	gtk_table_attach(GTK_TABLE(table), pm_widgets.plugin_label, 1, 2, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
-	gtk_table_attach(GTK_TABLE(table), pm_widgets.description_label, 1, 2, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
-	gtk_table_attach(GTK_TABLE(table), pm_widgets.author_label, 1, 2, 2, 3, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+	gtk_table_attach(GTK_TABLE(table), pm_widgets.author_label, 1, 2, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+	gtk_table_attach(GTK_TABLE(table), pm_widgets.filename_label, 1, 2, 2, 3, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
 
 	desc_win = gtk_scrolled_window_new(NULL, NULL);
 	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(desc_win),