REAP

I've completed a rough draft of this workflow and emailed a request for comments.

https://code.ecoinformatics.org/code/reap/trunk/usecases/terrestrial/workflows/PAR_workflow/par-data-clean.xml

It is very fine grained, and uses generic R actors that I've created, including: univariate threshold test, bivariate threshold test, aggregate, set name, merge, R sqrt, R division.

Or'ing two arrays together, and separating dataframes into components were also common tasks and non-generic R actors were used.

After some feedback from Matt, much of the plumbing that made this workflow so large has been removed.

Actors have been made more generic and parameter-driven, and workflow simplified, with an eye towards making it more ecologist-friendly, and actors more reusable.

Original Bugzilla ID was 3364