• Improve AppVeyor tests for older Perls (Thanks Roy Ivy)
  
• Check for Test::More 0.94 and skip tests if not installed where
  done_testing() is used (Thanks Roy Ivy).
  
• Improve workaround for broken Win32 File::Temp taint failure (Thanks Roy Ivy).
  
• Skip/todo tests which fail under Devel::Cover (Thanks Roy Ivy)
  
• Add checks and skip_all checks for non-core test modules (Thanks Roy Ivy)