Remove the collapse animation for the package list's initial appearance.
For large datasets, the initialization time was through the roof (90+
seconds for a package list with around 1500 items in it). I think the
problem was that the PackageWidgets were going through animations while
also trying to measure things (slideUp/Down to collapse/expand all at
once, and trying to measure the width of the barchart bars for label
positioning). I added an 'animate' parameter to the 'collapseChildren'
method, and use false for the initial collapse of all of the widgets. I
also removed the 'animating' property, since nothing was using it, and
it looked relatively expensive to calculate. Now the 90 second load time
is more like 5 seconds (for the dataset I was testing with, Jenkins)