anchor.diff:   * +kak_cursor_cursor+: column of the end of the main selection
    * +kak_hook_param+: filtering text passed to the currently executing hook
   
  +Note that in order to make only needed information available, Kakoune needs
  +to find the environement variable reference in the shell script executed.
  +Hence +%sh{ ./script.sh }+ with +script.sh+ referencing an environement will
  +not work.
  +
   for example you can print informations on the current file in the status
   line using:
   
  
positive.code: options related to writing wont be taken into account if set in the
  window scope (+BOM+ or +eolformat+ for example).
  
  New options can be declared using the +decl+ command:
  
  -----------------------------
  :decl <type> <name> [<value>]
  
negative.code: Defining Commands
  -----------------
  
  new commands can be defined using the +:def+ command.
  
  ------------------------------
  :def <command_name> <commands>
  