Refactorize the function rendering a problem data

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Simplify the glade file and add a widget for messages

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Suggest reporting a bug if it wasn't reported yet

- closes rhbz#910317

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Don't allow reporting if the problem is not reportable

- closes #13

Signed-off-by: Jakub Filak <jfilak@redhat.com>