src/main/java/de/vandermeer/execs/options/ExecS_CliParser.java
public void usage(String appName){
		HelpFormatter formatter=new HelpFormatter();
		formatter.printHelp(appName, null, this.options, null, false);
	}
public void usage(String appName){
		HelpFormatter formatter=new HelpFormatter();
		formatter.printHelp(appName, null, this.options, null, false);
	}
Prints a usage screen based on set options.
@param appName name of the application to be used for the usage screen