Removed option 'triggerevent' – added option 'tooltipanchor' instead.
Fixed an issue with multiple event handlers attached to the opening element.

Described here: https://github.com/vast-engineering/jquery-popup-overlay/commit/becaee80279a39a93dcff542d8ddc8486189833a#commitcomment-6041231
Code refactoring.
Fixed javascript scope issue with $el.
1.6.5