Updates the HeaderletHDU class to use PyFITS's new FitsHDU class as its base.

This works mostly the same way as the old implementation.  The differences are
as follows:

 * The headerlet data is no longer needlessly encapsulated in a tar file;
   instead it's included directly as an embedded FITS file which should work
   fine for most FITS readers (though most won't know what to do with it, and
   will just treat it as raw data).

 * A few new keywords are included in the HeaderletHDU's header--these keywords
   (the XINDn keywords) give the offsets of each HDU embedded in the
   HeaderletHDU.  Howver, this information is not currently used.

 * In addition to the `.headerlet` property the `.hdulist` property is
   provided, which returns the HeaderletHDU's contents as a normal `HDUList`
   object instead of a `Headerlet` object.



git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stsci_python/trunk/stwcs@13979 fe389314-cf27-0410-b35b-8c050e845b92

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