Changed notification of discarded frames for TP_STATUS_CSUMNOTREADY and TP_STATUS_COPY, now its ROFL_ERR and every 1000
Checking for veth interfaces to disable tx checksum offload
Breaking code for veth interfaces checksum offload into functions. tested
Added configuration of checksum offload in config.h
veth checksum offload: fixed traces and some valgrind errors
Implemented disabling checksum offload for veth interfaces. Tested, no valgrind errors. Fixes #41
Merge branch 'devel-0.6' into disable_chksum_offload