Check the application source does not exist before adding
Add a plugin method to convert a local file to a GsApp
Do not use a GAction for setting the verbose output

This doesn't happen early enough to capture all the useful startup data.
trivial: Show the window when specifying applications on the command line
trivial: Never show the refresh button on the overview page
Add the concept of a 'local' not-yet-installed package file
trivial: Wrap the application summary to avoid it forcing the window very wide
trivial: Do not show the 'Details' header if we have no description
When installing local packages set the summary and description

In the case of a long multi-line description, use the first line for the summary
and the rest as the description.
Teach the PackageKit plugin how to install local packages
trivial: Fix a crash when installing local packages
Do not show the 'Support' box for local packages
trivial: Don't show a missing rating on a local file
Add a 'filename' action that can display details about a local file