Global stats improved: added lost, disc and fail.
Minor changes...
Using new global stats definition.
Minor changes.
Group stats moved into pfq_group_stats struct.
PFQ socket stats structures renamed.
Removed dependency from pf_q-module header.
pfq_group small refactorying.
Code adaptations...
Using pfq_get_groups to retrieve the pointer to the current group.
Added get_stats method to monad for future use.