Add ability to spoof IPv6 source address to match sFlow agent address…

… when converting to NetFlow.

bump version in spec file

add extended_timestamp

netflow feeds should still use now() for timestamp

Add time-regulated pcap playback with infinite looping

update configure.ac

bump version to 6.05

copy over function, hardware-trap and linux-reason elements for disca…

…rd samples; bump version to 6.04

allow any flow sample element to be included in a discard sample; bum…

…p version to 6.03

bump version to 6.02 for release