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Ubiquity Command: download-files [regexp pattern] to [folder]
Author: Duane Johnson
Email: duane.johnson@gmail.com

Description: Downloads files matching the regular expression pattern to a folder.

Changes:
  2009-02-18
    - Fixed that null stylesheets caused an exception
  2009-02-17
    - Fixed that items in the "head" section of the document were not being included (e.g. CSS files).
    - Added full search of all stylesheets (CSS) for rules that include url() resources.
    - Added recursive pattern matching into frames and iframes.
    - Fixed that a malformed regexp would cause a silent exception
    - Improved messages when regular expression is malformed,
      and when there are no matches
    - Added greyed-out urls next to filenames
    - Renamed 'SaveAll' object to 'DownloadFiles'
    - Formatted comments
    - Added gialloporpora's change to only display filenames instead of full URLs
  2009-02-15
    - Fixed example string to use 'download-files' instead of 'save-all'
  2009-02-14
    - Use 'unescape' to preview URLs in case they are URL escaped
  2009-02-12
    - Improved auto-suggestions
    - Added comments / documentation
    - Added noun_type_local_directory
    - Removed duplicate filenames in preview list.
    - Added folder.png icon when optional "to [folder]" is given.
    - Changed command from "save-all" to "download-files".