Added patch from Phil Carns.  From Phil:

The patch adds a little bit of logic to tw_event_new() to keep track of
the smallest timestamp offset passed into that call. The idea is that
you could look at this value to help figure out a good g_tw_lookahead
setting for conservative runs.


git-svn-id: https://subversion.cs.rpi.edu/svn/rossnet/trunk@682 2481c9be-fdbf-de11-a427-00b0d041e3d9
Merge remote-tracking branch 'upstream'