Dates correspond (roughly) to SSC Archive releases.

12apr2018
- command -colorpalette- now supports combining colors from different palettes
- the list of palettes provided to -colorpalette:- can now contain . to insert 
  gaps
- command -symbolpalette- displayed an error message if a custom palette with 
  just one element was specified; this is fixed
  
22dec2017
- released on SSC