report-gtk: confirm the ask dialogs on 'Enter'

This commit adds a convinient way of closing an ask dialog. If user
enters some text, hitting 'Enter' key closes the dialog. Closing the
dialog with empty input text is not allowed because it is simmilar to
clicking 'Cancel' button.

Closes rhbz#1075589

Signed-off-by: Jakub Filak <jfilak@redhat.com>
wizard: introduce the searched words list

Replace the navigation arrows by a list consisting of lines containing
the searched words.

Resolves rhbz#998999
Merge branch 'rhbz1075589_enter_closes_ask_dialog'
Merge branch 'rhbz998999_private_data_overview'
update the list of ignored words

Add "Cannot access memory" which is often contained in a locally
produced GDB backtraces.

Signed-off-by: Martin Milata <mmilata@redhat.com>