Fix box plot scaling when loading multiple data sets on the same axis.
When loading extra data sets, don't print errors if no files were selected.
Fix legend width computation when multiple tabs are open in the GUI.
Manage plot colours to ensure same series always has the same colour,
and cycle line styles and markers when plotting multiple data sets.
Fix divide-by-zero when scaling with a bottom percentile of 0.
Do axis resize (to make room for the legend) on every canvas resize.

Makes it work properly without the GUI.
Update CHANGES.
Add tcp_1up_noping and tcp_2up_delay tests.
Fix plots of tcp_1up_noping test.
tcpdump-wrapper: try to create destination directory if it does not exist.
GUI: Always save dir of opened file for subsequent opens.
Stop the two streams at the same time in tcp_2up_delay test.
Support running multiple batch commands in one go.
Have tcp_2up_delay total length be LENGTH+DELAY
Add --subplot-combine to draw separate data sets on separate subplots.
Use deepcopy when copying settings objects.
Update example.batch.
Turn ditg_test into a proper VoIP test.
Fix incomplete comment.
Merge branch 'master' of github.com:tohojo/netperf-wrapper