This feature was not reliably available: neither pl_editor nor GAL supported
it. It has been replaced over the past few commits with a new zoom-to-selection
tool available in all applications and modes.
* Fix grid select box update bug on context menu.
* Fix via size and track width select box update bugs.
* Fix layer pair indicator button update bug.
* Fix auto track width tool bar control enable bug.
* Fix via size and track width select status bug in context menu.
* Fix layer select box and layer control widget select bug when current
layer is removed.
* Add virtual function to notify objects derived from EDA_DRAW_FRAME that
the units setting has changed.
* Coding policy class naming fixes.
Chris Pavlina
jean-pierre charras
Dick Hollenbeck
Wayne Stambaugh