gui: Problem Details suite

+ ProblemDetailsWidget
+ ProblemDetailsDialog

Related to abrt/gnome-abrt#64

Signed-off-by: Jakub Filak <jfilak@redhat.com>
gui: port to Problem Details suite

- show the "Details" button on the comment page
- use the problem details widget on the summary page

Signed-off-by: Jakub Filak <jfilak@redhat.com>
spec: install Problem Details stuff

Related to abrt/gnome-abrt#64

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