Change the VTKM_CONT_EXPORT to VTKM_CONT. (Likewise for EXEC and
EXEC_CONT.) Remove the inline from these macros so that they can be
applied to everything, including implementations in a library.
Because inline is not declared in these modifies, you have to add the
keyword to functions and methods where the implementation is not inlined
in the class.
These asserts are consolidated into the unified Assert.h. Also made some
minor edits to add asserts where appropriate and a little bit of
reconfiguring as found.
This makes is slightly easier to use as you do not actually have to
construct the DataSetBuilder object but just call its static method.
The DataSetBuilderExplicitIterative methods are not static because they
use state of the builder object to create the data.
There was an inconsistency in naming classes where axes-aligned grids
with even spacing were sometimes called "uniform" and sometimes called
"regular". Maintain consistency by always calling them uniform.
