Log Message:
Update to pcb-20070912

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Release Notes for PCB snapshot 20070912
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This release represents nearly 200 commits and as such this summary
clearly is not complete.  See the ChangeLog file for the complete list
of changes.

- Many many bug fixes.  Too many to list.
- Added keystone, C&K, Nichicon, and Optek footprint libraries
- Add attribute editor to the GTK HID
- Add a fileselect() function to the HID spec
- Fix ps output with drill helper on
- Add a visual indicater when elements are locked
- Corrections to the manual
- BOM can export in mm as well as mil
- Fix a ps output bug with arcs
- Fix some memory leaks found with Coverity
- Added autoconf test for buggy versions of m4
- Fixed some footprint drill sizes
- Add user customizable menus for the gtk HID.  The gtk HID now is capable
  of reading the same format menu resource files as the lesstif HID.
  This represents significant rework of the menu code and menu callback code.
- Added Center() action
- Store the file format in the .pcb file.  This will let pcb know when
  presented with a file which is too new.  The code for checking the format
  was present in the prior snapshot.
- Fix DRC checking of square pads to square pads
- Added window panning/cursor warping
- Add the ability to directly load a footprint from a file as if it were
  a complete layout.
- Add a Popup() action