fixed minor problems and fixed Layer Alignment Target bug.

* Remove redundant background redrawing RedrawActiveWindow.
* Remove redundant managed cursor callback in RedrawActiveWindow.
* Use refresh to redraw instead of directly calling RedrawActiveWindow.
* Remove unused SetDrawBgColor for drawframe.cpp.
* Fix compiler warning in cvpcb/cvframe.cpp.
* Fix menu spelling and syntax errors in pcbnew.
* Rename Trace_Curseur to DrawCursor in common/drawpanel.cpp.

patch for relative paths.

Code cleaning.
Patch for 3D problem with macOSX

files cleaning

fixed a grid refresh problem when using fast algo in drawpanel.cpp

Fixed aui component for other platform other than OSX, with wxwidgets 2.9 we dont need to define aui

Added patch for macOSX
turn on fast algo for draw grid (should work now)

Fast algo currently disabled (tests needed)

Ugly but necessary fix to display toolbars in latest Linux version (tested with Ubuntu 9.10 updated)

* Fix debug asserts when passing NULL pointers to wxAuiPaneInfo.
* Fix Kicad main window sash sizer bug when using wxAui.
* Remove specctra_test from Visual Studio builds to prevent build errors.
* Add WIN32 to layer widget test so it will build properly on Visual Studio.
* Fixed compiler conversion warnings in PCBNew.
* Fixed worksheet print scaling in PCBNew.
* Minor code renaming.

Code cleaning and using DrawPanel->Refresh() instead of ReDraw() when possible.