- new printf-style error message generator: NsfPrintError() - simplified error handling: removed NsfVarErrMsg() and NsfErrMsg() and replaced it by NsfPrintError()
- quote name of referenced parameter in error message to ease reading - new parameter checker "parameter", performing an approximate checking for valid parameter specs - set NSF_ARG_CHECK_NONPOS only when there are multiple arguments - remove space checking for NSF_ARG_CHECK_NONPOS in favor of parameter checker