add image export path macro

core/modules/widgets/image.js

@@ -52,7 +52,7 @@ ImageWidget.prototype.render = function(parent,nextSibling) {
 		tiddler = this.wiki.getTiddler(this.imageSource);
 	if(!tiddler) {
 		// The source isn't the title of a tiddler, so we'll assume it's a URL
-		src = this.imageSource;
+		src = this.getVariable("tv-get-export-image-link") || this.imageSource;
 	} else {
 		// Check if it is an image tiddler
 		if(this.wiki.isImageTiddler(this.imageSource)) {