various adjustments to search macro augmentation
various adjustments to search macro augmentation

* moved code to top (seems higher-level, if somewhat arbitrarily)
* corrected hijacking method (apply is more robust, not exposing cached
  function in macro's namespace)
* made description more concise; also added leading space
* used object for jQuery's attr method

FND/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace