Add -top (or -Xtop) option similar to existing -bottom option.
Required for publishing snapshot APIs on java.net, where a license
notice needs to be displayed prominently on each page.

The "top" text should be added to the following HTML files below api/ directory:

  Include all *.html files except:

  /api/index.html (frameset file)
  /api/allclasses-frame.html (lower left-hand navigation pan)
  /api/allclasses-noframe.html (notice appears if browser does't support frames)
  /api/overview-frame.html (upper left-hand navigation pan)

Notice the script must not include files with no extension,
such as:

  /api/package-list

Or files with other extensions, such as:

  /api/**/*.gif

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