Users can now choose to display current page / total pages as a percent (rounded) on the statusbar next to the page numbers themselves.
E.g., when viewing page 205 of a 532-page document, [205/532] on the statusbar can now read [205/532 (38%)].
This can be configured by setting the statusbar-page-percent boolean value (default is false) in a config file or via :set.
Implements a feature requested in #260 (closed).