a-d-oops: add 'update' command line argument

If the argument (-u PROBLEM) is used, abrt-dump-oops saves the data
obtained from input in the passed problem directory.

Related to #662

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Martin Milata <mmilata@redhat.com>
vmcore: provide all problem elements necessary for the reporting

Closes #662

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