update to pcb-current-20040530. Changes since last snapshot are:

========================================================================
Release Notes for PCB snapshot 20040530
========================================================================
This has been an exciting 3 months for PCB.  Many improvements have
been made in the program as well as additions and improvements to the
footprint library.  Thanks to everyone who has provided feedback,
patches, etc.

----------------------
Additions/Improvements
----------------------
  - Expanded DRC checking
  - "Realtime" DRC checking
  - DRC settings are now stored in the board fle
  - Centroid (X-Y) and bill of materials output
  - Dynamic menus.  Users can now customize the menus via a
    site-wide, per-user, or per-project menu resource file.
  - Significant improvements to autorouting of congested designs.
  - Autorouter can now use power planes.
  - Improved appearance in autorouter output.
  - Silk on pads/pins is clipped in RS-274-X output
  - Ordering is preserved when writing output files so that diff
    may be effectively used on pcb files.
  - The autoplace feature now actually works
  - Added ToggleVisibility action
  - Most of the database is now kept in rtrees which avoids linear
    searches.  This speeds up operation significantly.
  - Added SetFlag, ClrFlag, ChangeFlag actions

---------
Bug Fixes
---------
  - pin/pad bounding box calculation fixed.  Components can
    now be placed closer to the edge of the board.
  - miter trace optimization bug.
  - Fix bug with pins which are enclosed by multiple polygons.
  - Shorts to unnamed elements and pins are handled correctly.
  - Various memory leaks fixed.
  - Fixed some bugs with a really high zoom.
  - Fixed default media selection in postscript print dialog
  - Fix some DRC bugs with square pins.

------------------
Footprint Library:
------------------
  - Added SOJ footprint family (~geda library)
  - Added CTS series 742/3/4/5/6 resistor pack footprints (~cts library)
  - Added PKG_CONNECTOR_DIL macro to let the HEADER*_1 footprints work
    (~geda library)
  - Correct the SDIP footprints (~geda library)
  - Correct some Minicircuits footprints (~minicircuits library)
  - Correct some panasonic footprints (~panasonic library)
  - Change refdes silk size for sockets (~johnstech library)
  - Increase soldermask relief on some mounting holes
    (~johnstech library)
  - Convert the COMMON_SMT_DIL_MIL and COMMON_SMT_DIL_MM macros
    used by several other libraries to the hi-res format.
  - Correct pin count on 100 pin QFP packages (100 not 72)
    (~geda library)
  - Correct pin count on HEADER60_2 (60 not 50) (~geda library)

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