Few whitespace and cleanups + finishing up osc group list

The functionality now can list content of one grouping request:

root@bugaboo: ~ # osc group list 196531
GR#196531 | scarabeus_factory | 2013-08-27T08:54:35 | testing group

Contains following requests:
SR#196485 | server:database/sqlite3:77 | mvyskocil | 2013-08-27T07:38:29 | new
SR#196359 | devel:tools/doxygen:68 | factory-repo-checker | 2013-08-26T09:42:02 | new