Print the file header of the script that calls this function.

    This function assumes that the first three lines of a Bash script are
    comment lines that briefly describe the script.  This function prints
    those three lines.  The is very useful when you have lots of scripts
    and lots going on in them so that as each one is run, the three-line
    header is shown on the screen, and in a color that is distinct from
    most other screen content.

Examples:

    > cat foobar # Assume you have some script with the following content.
    ######################################################################
    # This is the foobar script.
    ######################################################################
    . jamaratus
    announce
    echo "Hello World!"

    # The header will appear in the color for announcements.
    > foobar
    ######################################################################
    # This is the foobar script.
    ######################################################################
    Hello World!

Usage: announce <action:<self>> # Where action is:

    <self>  This command finds the file it's in by itself.  [default]
    help    Help by showing these instructions.