Preliminary version of script to generate the MODEL collections. It's not otherwise part of diffcol, and is to be used on a binary or svn checkout of GS2 where the model-collections are to be rebuilt (which will be tested against by diffcol nightly). At present, if you put the script in a GS2 installation, the script checks out the existing model-collections, copies them into a new collect folder which is stripped of svn subfolders and then rebuilds all collections in that new collect folder.