n string on the standard output and waits for the user to type yes or no in the standard input. Returns true if the user has typed yes, false if the user has typed no.
The optional parameter progname is used as prefix for ... ses, not variables; this is an attempt to let the user redefine functions to his taste.
Testing Intro: ... working script, an option would be given for the user to quit this cycle, and proper cursor controls wo
