run_sicktree_model: Run a distribution model using a raster brick as predictors
In pieterbeck/CanHeMonR: Tools for canopy health monitoring through image analysis

For each class in .shp polygon file, run an existing, calibrated, distribution model using a raster brick as predictors

1	run_sicktree_model(r_pred, vuln_classes, model_dir, outp_dir)

`r_pred`	A rasterbrick or rasterstack containing the predictor layers
`vuln_classes`	A list of the classes you want to run existing models for Only the fist place in each element will be used to search for existing models.
`model_dir`	The folder and filename prefix to where the models were saved by `calibrate_sicktree_model`
`outp_dir`	The folder and filename prefix to save the model output to