pat_multiplot() enhancements

[jonathancallahan]

We need to design all of our output plots for one of two cases:

1. use in a public facing web service where clean and simple is the priority
2. publication-ready, fully annotated plots

The pat_multplot() function is in need of some basic improvements:

• axis labels
• title
• symbol should be semi-transparent squares

Ideally, we would have a set of defaults that a savvy user could override. If it's easy to implement, using a ggplot theme would be ideal.

And what can be done with the ... parameter?

[hmrtn]

the ... parameter is very cool! It allows any number of ggobjects to be passed into the function to plot on a single pane.