C++11 offers cleaner ways to perform certain common tasks that were difficult or required hacks in C++98. Code will be safer and more maintainable if it is updated to match C++11 recommendations.

This ticket includes the following changes:

• Replace 0 or NULL with nullptr.
• Replace typedefs with type aliases.
• Simplify existing template metaprogramming with <type_traits> components, if possible.
• Make functions that just throw "never call this" exceptions deleted (note that any pybind11 wrappers must still throw exceptions).

Any changes made on this ticket except the last item must not change the behavior of any class, even if that behavior is untested.

The classes covered by this ticket are (based on assumed simplicity, and therefore subject to change):

• afw::cameraGeom::CameraPoint
• afw::cameraGeom::CameraSys
• afw::cameraGeom::CameraSysPrefix
• afw::cameraGeom::Orientation
• afw::coord::Coord and its subclasses
• afw::coord::Observatory
• afw::coord::Weather
• afw::detection::Threshold
• afw::geom::Angle
• afw::geom::AngleUnit
• afw::geom::Box
• afw::geom::CoordinateBase and its subclasses
• afw::geom::CoordinateExpr
• afw::geom::Span
• afw::geom::SpherePoint
• afw::geom::polygon::Polygon
• afw::image::Calib
• afw::image::Color
• afw::image::DefectBase
• afw::image::Filter
• afw::image::FilterProperty
• afw::math::FitResults
• afw::math::Function and its subclasses
• afw::math::MaskedVector
• afw::math::Statistics
• afw::table::BaseRecord and its subclasses
• afw::table::ConstFunctorKey
• afw::table::FieldBase and its subclasses
• afw::table::InputFunctorKey and its subclasses
• afw::table::KeyBase and its subclasses
• afw::table::Match
• afw::table::OutputFunctorKey and its subclasses
• afw::table::ReferenceFunctorKey
• afw::table::SchemaItem
• afw::table::io::Persistable
• afw::table::io::PersistableFacade