Log Message:
update to pcb-20070208p1

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Release Notes for PCB snapshot 20070208
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- Add polygon clipping code.  This is a big change to how polygons are handled.
  The new code now removes islands and correctly identifies open circuits caused
  by a trace fully cutting through a polygon.  In addition, the RS-274-X output
  is now simpler and works with some board houses that use older non-conforming
  sofware.  Different styles for thermal reliefs are also now supported as part
  of the polygon clipper code.
- Add support for plugins
- Many improvements to the autorouter.
- Various improvements to the trace optimizer.
- Add a fontmode for editing pcb fonts
- Add progress() hook to HID structure
- Fix a bug with non-functional windows on some window managers commonly
  found on OS-X
- Add support for controlling pcb via dbus
- Fix various bugs which would cause a crash
- Add --scale for postscript scaling
- Intercept window manager delete events with the GTK gui
- Scan the .pcb file for a FileVersion value.  This is not written out yet
  but will be in future versions.
- Warn if non-manhattan lines are trying to become pads.
- Allow no-solder paste pads to support fiducials
- Report in mm or mils as selected by user
- Allow reordering of layers
- add some more QFN packages
- fix building with sun studio c compiler
- Made a pcb installation be relocatable.
- Convert the m4 libraries to newlib libraries as part of building a distfile.
  The m4 libraries are still considered the sources and as such are still
  distributed but this eliminates the need for m4 at runtime for footprints.
- Got rid of the pcb wrapper script around pcb-bin.
- Remove some old footprints of questionable naming, accuracy, or usefulness.
- Get the autosave/backup code working on all GUI's
- Fix some drill size rounding in the reports
- Changed the backup file name to be derived from the .pcb file name
- Added a command line option for DrawGrid
- Fix logic for adding new ratlines
- Fix gtk grid when board is flipped
- Add "find" and "rip-up" buttons to the netlist window
- Draw plated holes when exporting
- Fix some bugs when converting selection to element
- Fix build on cygwin
- Enhance the win32/build_pcb script used to generate a non-cygwin windows
  installer.
- Make pcb work under non-cygwin windows