Scripts have the choice of printing to the console whenever they need to communicate something to the developer. They would normally use a standard `println` sentence. Sometimes it's useful to know what a script is doing with further detail but it makes no sense to see that information every single time. A conditional output is required.

All scripts inherit a `debug()` closure that will print its argument to stdout if an only if the following flag is enabled: `griffon.cli.verbose`. As an example, the following script has two print outs

    includeTargets << griffonScript("Init")
    target(main: "The description of the script goes here!") {
        println 'Hello world!'
        debug 'Hello World (debug)'
    }
    setDefaultTarget(main)

Running the script without the flag will print out 'Hello World!' all the time but never the second one

    $ griffon hello
    Welcome to Griffon 0.9.5-rc2 - http://griffon.codehaus.org/
    Licensed under Apache Standard License 2.0
    Griffon home is set to: /usr/local/griffon
    …
    Environment set to development
    Hello world!

The second message will only appear if you specify the verbose flag

    $ griffon -Dgriffon.cli.verbose=true hello
    Welcome to Griffon 0.9.5-rc2 - http://griffon.codehaus.org/
    Licensed under Apache Standard License 2.0
    Griffon home is set to: /usr/local/griffon
    …
    Environment set to development
    Hello world!
    [11/11/10 4:43:04 PM] Hello World (debug)