Example alert sheet implemented using NSAlert.
Custom sheet displays without error, buy not attached.
Custom sheet works, but output tables are blank.
Tables display information, but left is disabled and right is pointer to the table.
Updated TODO (top of ELCentralController.m)
Disabled headers.
Removed (cocoa) from project name.
Complete basline functioning restored.
Progress.
Alert for directory not existing propagated from master branch
Program now quits when window is closed.
Updated todo.
Ignore list now functional.
Menu updated
Added check and response for no duplicate files found.
Merge branch 'single_window'

* single_window:
  Added check and response for no duplicate files found.
  Menu updated
  Ignore list now functional.
  Updated todo.
  Program now quits when window is closed.
  Alert for directory not existing propagated from master branch
  Progress.
  Complete basline functioning restored.
  Removed (cocoa) from project name.
  Disabled headers.
  Updated TODO (top of ELCentralController.m)
  Tables display information, but left is disabled and right is pointer to the table.
  Custom sheet works, but output tables are blank.
  Custom sheet displays without error, buy not attached.
  Example alert sheet implemented using NSAlert.

Conflicts:
	Duplicate Finder (cocoa)/ELCentralController.m
	Duplicate Finder (cocoa)/ELDuplicateFiles.m
	Duplicate Finder (cocoa)/en.lproj/MainMenu.xib
	Duplicate Finder (cocoa)/outputWindow.xib
	Duplicate Finder.xcodeproj/project.pbxproj
	Duplicate Finder.xcodeproj/project.xcworkspace/xcuserdata/EL.xcuserdatad/UserInterfaceState.xcuserstate
	Duplicate Finder.xcodeproj/project.xcworkspace/xcuserdata/EL.xcuserdatad/WorkspaceSettings.xcsettings
	Duplicate Finder.xcodeproj/xcuserdata/EL.xcuserdatad/xcschemes/Duplicate Finder (cocoa).xcscheme