cofmatch.h => added method get_ipv6_flabel_value() and get_ipv6_flabel_mask(), changed behaviour of get_ipv6_flabel(), as it returns now the masked flow-label value
Merge remote-tracking branch 'origin/devel-0.4' into devel-0.5
Merge branch 'devel-0.5' into devel0.5/pipeline_of13