Component selection page in Qt 5 binary installer is confusing

There are a few usability issues with the component selection page of the installer wizard:

1. No components are selected by default, so every user needs to make a decision. It might be better to default to something that will work for a new user who doesn't know what components to choose. Also, the Default button deselects all components - an installer that installs nothing by default is not very useful.

2. The top-level component is called "Qt Installer", and there's no further explanation of what it means. It would probably be better to call this "Qt 5.0.0", or hide it.

3. The tree of components is confusing. It seems that the only installable components are the source files and the binary files, yet the fully expanded tree has six nodes.

4. I'm not convinced that installing only source files makes sense for a binary package (why not just install a source package if you only want the sources?). Perhaps the binary installer doesn't need a component selection page at all.