Processes an RSP file product.
# S3 method for RspProduct
process(object, type=NULL, envir=parent.frame(), workdir=NULL, ..., recursive=TRUE,
  verbose=FALSE)Returns the processed RSP product output as another RspProduct.
  If no processor exists, the input object itself is returned.
A character string specifying the content type.
A temporary working directory to use during processing.
     If NULL, the working directory is not changed.
Optional arguments passed to the processor function.
If a positive number (or +Inf), then processed output that can be
     processed will be processed recursively (with this argument being
     decreased by one).
     A value TRUE corresponds to +Inf (infinite processing if possible).
     A value FALSE corresponds to 0 (no further processing).
See Verbose.
Henrik Bengtsson