If two or more msarc diagrams are presented, it may be helpful if GO
categories that occur in multiple diagrams are the same color. This
functions allow the copying of the color palette from one msarc object to
another, so that when the second is plotted, it will resemble the first.
Usage
msarc.copyColors(target,source)
Arguments
target
an msarc object to load the color palette into.
source
an msarc object from which to get a color palette.