Made title of search boxes show as tooltip

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31322

The title is now a tooltip (component specific text).
And the placeholder is changed to the default 'Search' (JSEARCH_FILTER)

![tooltips](https://f.cloud.github.com/assets/744259/743098/109760ae-e3e0-11e2-80bf-336344f7c239.png)

#### Testing Instructions
See tooltips on the search boxes in the list views