fix #102  (highliting)

Highlighting has been activated in the 2nd tab.

use this styling:

	[swissbibmulti/css/orange.css]
	span.highlight

use these helpers:

	[VuFind\View\Helper\Root\Highlight]
	$this->highlight:
	- replaces {{{{START_HILITE}}}} with '<span class="highligh">
	- replaces {{{{END_HILITE}}}} with '</span>

	[Swissbib\View\Helper\RemoveHighlight]
	$this->removeHighlight:
	- replaces {{{{START_HILITE}}}} with '<span class="highligh">
	- replaces {{{{END_HILITE}}}} with '</span>