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Version History:

 1.2 1999-10-26 split off from FileTransfer

 1.3 1999-10-28 add safety code when length specified
                is -1 or 0, to copy as if the length were unknown.

 1.4 1999-10-29 ensure every file closed, including ZipFile
                safety check for null parms.

 1.5 2001-01-23 use more elegant
                reads in the while loops instead of breaks.

 1.6 2002-04-22 conforming package name.

 1.7 2003-09-15 add closeTarget parameter to many methods
                rename download( InputStream, File ) to copy( InputStream , File )
                add copy( File, OutputStream )

 1.8 2006-01-10 add Download class.

 1.9 2006-02-05 reformat with IntelliJ, add Javadoc

 2.0 2007-05-17 add pad and icon

 2.1 2007-08-04 convert to JDK 1.5,
                add timeout support
                add sleep to avoid hogging CPU on stall
                add support for preferred MIME types on download.

 2.2 2007-08-24 use http Read methods.

 2.3 2007-09-26 add timeout.

 2.4 2008-07-05 add append method.

 2.5 2008-08-10 add setReadTimeout and setConnectTimeout methods.

 2.6 2015-11-26 add error message when download fails.

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