Merge the parameters from a partial list and the default list
setParams(opts, defaultOpt, keepNotMatching = FALSE)a partial list of parameters
a list with default values for every element
[FALSE] if TRUE, copy the elements appearing in opts, but not in 
defaultOpt to the return value. If FALSE, do not copy them, but issue a warning.
a list combined from opts and defaultOpt where every available element 
   in opts overrides the default. For the rest of the elements the value from defaultOpt
   is taken. 
   A warning is issued for every element appearing in opts but not in defaultOpt 
   (only if keepNotMatching==FALSE).