cli: batch reporting in abrt-cli

Added option process (p) to the abrt-cli.
With option process abrt-cli goes through all problems one by one (when
parameter --since is not specified) and asks the user what action will be
executed.

Related to rhbz#1066482

Signed-off-by: Matej Habrnal <mhabrnal@redhat.com>
Merge pull request #856 from abrt/rhbz1066482_batch_reporting_in_cli

cli: batch reporting in abrt-cli