fix missing parts in jquery ui update for accordion and tabs

* ui-icons_4488cc_256x240.png is removed, so switched to the most similar
  ui-icons_2e83ff_256x240.png instead
* css .ui-tabs-selected is renamed to .ui-tabs-active
* css .ui-tabs-hide is removed, use our own .hidden instead
* accordion options autoHeight, clearStyle, and fillSpace are merged into heightStyle
Merge branch '4.2/fix-jquery-ui-accordion-and-tabs'