Added an experimental tool to create logos from .bmp bitmaps. Added Potrace library to convert bitmaps to polygons

fixed bugs 587175 and 587176

* Fix a minor problem with wxFileDialog to open a file that no longer
  exists in PCBNew.
* Make GerbView open file behavior the same as PCBNew.
* Remove redundant PCB file wild card definition.
* Add open file refactor task to the todo list.
* Fix some minor code formatting issues.

Set cmake minimum version req. to 2.6.4. Added footprint name edition in the module editor dialog properties (see changelog).

Set minimum cmake version to 2.6.4. Added footprint name edition in the module editor dialog properties (see changelog).

Set minimum cmake version to 2.6.4. Added footprint name edition in the module editor dialog properties.