SYNOPSIS
void set_plural( string name)
void set_plural( true )
FILE
/std/base/language.h
DESCRIPTION
Sets the plural name of the object. If you set it to true, the object is a
"plural object" (e.g. scissors, trousers) and always used in plural form.
If you set it to the value 2, it acts like a "pair of things" - the parser
will treat it like a plural form object, but the plural name will still be
auto-calculated