Update to version 1.47.01. Changes since 1.47d include:

- New program Iget to retrieve documents by docid
- Fixed spurious output from Isearch -t option
- Fixed score calculation for Boolean searches
- Added -l parameter to zpresent to accept docids from a file
- Fixed a bad return state that caused a segfault when no files were
  found to index.
- Added improved entity replacement code to STRING class (J. Tyler)
- Improved algorithm for generating URL from path in EOS_GUIDE doctype
- Added hook for VIDB KeyLookup method
- Initial release of zpresent
- Fixed bug in EOS_GUIDE doctype which caused searches to sometimes fail
- Modified zpresent.dtd to stick the source field in the individual
  result elements, rather than on the container results element.
- Added method Result::GetVKey for virtual databases so you can tell
  which constituent they came from.  It's an egregious hack which just
  stuffs the database number at the front of the key so it can be
  included in the output from zsearch and parsed by zpresent.
- Rearranged some of the XML presentation for the FGDC doctype Summary
  element set
- Added a path->URL translation to EOS_GUIDE doctype to facilitate links
  back to original (crawled) source documents
- Cleaned XML text of characters which should be entities
- Added zsearch program for XML search output
- Added initial version of NASA EOS/Guide doctype
- Removed some extraneous output from vidb.cxx
- Added CIPC doctype for NASA/CIP Collection metadata
- Added delimiter to Isearch output (J. Millard)
- Improved XML results presentation in FGDC doctype

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