changelog
    
    
    - Wed, 27 Jan 2021 19:39:14 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 19:39:14 +0200] rev 192
 
    - handle exiting ZFC without using exceptions
 
    - Wed, 27 Jan 2021 19:32:55 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 19:32:55 +0200] rev 191
 
    - various little touchups
 
    - Wed, 27 Jan 2021 19:28:18 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 19:28:18 +0200] rev 190
 
    - updated copyright year