CHANGES IN VERSION 1.1.0

  * several enhancements to speed up execution.
  
  * specification of the sigma parameter of the half-normal detection function corrected.
  
  * units for density are now animals per sq km (not per 100 sq km).
  
  * a file with information about the run (info_<time>.txt) is produced.
  
  * the example data files moved to int/extdata directory and renamed; help file for these rewritten.
  
  * priors in the density plots for psi and N are now correct; incorrect priors for other plots removed.
  
  * new plot of detection function, with state space extent diagnostic information.

