add: 2 more widget preferences
add: UI for display & update interval
upd: version to 1.8
add: slideshow widget preference
add: UI updates with new option
add: code for new options
add: display all view code
add: display as table design
add: disable option per user input
upd: v1.8 changelog; feature promo; Opera 12+ warning
new: extension package v1.8
Merge branch 'display-all-data'