Highlight current motif when navigating using next/prev buttons

[bestchai]

Currently, one can "jump" to the next or previous motif using two buttons at the top of the search bar.

This works in an analogous way to how Ctrl-F works in most text editors or web browsers.

To resolve this issue, the current motif that you're on when using the next/prev buttons should be visually highlighted.

[Issue created by pqperry: 2014-08-28]