Tracer: add another panel to plot auto-correlation

[rambaut]

From @msuchard on August 13, 2015 17:35

Originally reported on Google Code with ID 149

To help David to add another panel to plot auto-correlation in Tracer.

Reported by dong.w.xie on 2009-09-03 23:40:47

Copied from original issue: beast-dev/beast-mcmc#158