Improve item list dialogs to handle long text values better.

Also allow resizing and reordering of columns too.
Allow some redirects for routing web sites by default.
[DOC] Images for the Track properties - since this has changed for version 1.5
Always open new .vik file in current window when no .vik file is loaded.

This is particularly for the case when a .vik file is loaded via drag and drop.