abrt-cli info: add "-s SIZE" option. closes #689

While at it,. removed useless empty lines in --help
and improved English:
"List even reported problems" -> "List reported problems too"

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>