Better document the creation of Field and CoordinateSystem
The constructors for vtkm::cont::Field
and vtkm::cont::CoordinateSystem
were missing from the built user's guide. The construction of these classes
from names, associations, and arrays are now provided in the documentation.
Also added new versions of AddField
and AddCoordinateSystem
to
vtkm::cont::DataSet
that mimic the constructors. This adds some sytatic
sugar so you can just emplace the field instead of constructing and
passing.