I always conjectured that command "incr0 <varname>" had been introduced
in Rivet as an alternative to 'incr'. In Tcl <= 8.4 this command failed
if the variable whose name is passed as argument is not set and incr0
simply creates the variable in this case
Starting with Tcl 8.5 command native 'incr' works in pretty the same way
and since we are supporting Tcl >= 8.6 I think we can safely remove it
at least from quattuor
-- Massimo
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