Add stub README file
Migrate viewer-macos from Avida SVN repository.  Update header references to new viewer-core header locations.  Convert viewer-core tool usage to Apto.
Implement the Avida-ED fitness color scale in viewer-core and viewer-macos.
Remove debug output from MapGridView.
Fix RWLock handling between viewer-core and viewer-macos.   Implement on demand map mode changing.   Connect map zoom adjustment controls and methods.
Implement zoom operation in MapGridView.
Center map in view.  Autozoom initial map view.
Update file comment headers for viewer-macos project.
Update README file with basic outline structure and license information.   Add README to the Xcode project.
Reorganize viewer window to tighten up scale and map view.
Implement gradient scale rendering.
Add AvidaEDPopViewStatView class to control stat view subpanel resizing.
Add support for displaying the overall scale label on the scale.
Move cWorldDriver into the Avida namespace.
Add basic scrolling support to MapGridView.
Add first attempt at CenteringClipView to, in theory, better handle centering the map scroll view.

Unify coding style of Objective-C methods.
Rework CenteringClipView to properly manage scroll bars and keep the document frame origin from shifting.
Explicitly initialize viewPoint in CenteringClipView.
Add .gitignore to ignore .DS_Store files.
Remove subversion from requirements in README
Update README to reference avida top level git repository