* Renamed the "Option" menu to "Show", removed the now redundant "Show" from
the items in that menu.
* Add an "Only featured packages" item in the Show menu. This item is disabled
as soon as the user types something in the search terms field. Othetwise,
this setting is respected, i.e. one can combine the featured setting with
other settings, i.e. show all featured packages of a certain depot and in a
certain category.
* Added PackageInfo::IsProminent() and removed the respective method from
the MainWindow (which only considered a package prominent if it was not
yet installed).
* "Show -> Installed packages" now defaults to on. There have been complaints
on Trac and I guess rightfully so. The use-cases in which one starts
HaikuDepot and wants to know about installed packages are just as likely
as the use-case where one wants to install new software.
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