Remove struct subtyping example.
Add a function ctypes_copy_bytes for building GC-managed blocks.
Add an interface for primitives.ml.
Make Primitives a public module.
Expose a primitive function.
Add ctypes.stubs subpackage.
Generation of 'external' declarations from types.
Add bigarray support for external declarations.
Basic read/write stub generation support.
Record properties of global names.
C stub generation from types (WIP).
Basic code printing (WIP).
More work on C stub generation.
C_stubs interface.
Basic printer for generated ML code.
Generate function for retrieving primitive constructor names.
Handle external names in generated ML stubs.
Disable 'noalloc' for the moment.

We need an interface for specifying interaction with callbacks.
Disable the "float" attribute for the moment.
Add interface for ml_stubs module.