Include std::int64_t for distribute_entity_data (FEniCS#3651)

* New version

* Remove includes

* Remove unused includes

* Add in std::int64_t in Python interface

* Move implementation to header file

* Remove cpp from target sources

* Remove Anonymous namespace

* Simplify md namespace

* Modify copyright notice to include Garth as the code was historically in the cpp file

* Fix includes

Author: jorgensd

cpp/dolfinx/io/CMakeLists.txt

@@ -10,6 +10,7 @@ set(HEADERS_io
   ${CMAKE_CURRENT_SOURCE_DIR}/xdmf_function.h
   ${CMAKE_CURRENT_SOURCE_DIR}/xdmf_mesh.h
   ${CMAKE_CURRENT_SOURCE_DIR}/xdmf_utils.h
+  ${CMAKE_CURRENT_SOURCE_DIR}/utils.h
   PARENT_SCOPE
 )
 

cpp/dolfinx/io/XDMFFile.cpp

@@ -13,6 +13,7 @@
 #include <dolfinx/common/log.h>
 #include <dolfinx/fem/Function.h>
 #include <dolfinx/graph/AdjacencyList.h>
+#include <dolfinx/io/utils.h>
 #include <dolfinx/mesh/Geometry.h>
 #include <dolfinx/mesh/Mesh.h>
 #include <dolfinx/mesh/MeshTags.h>
@@ -379,7 +380,7 @@ XDMFFile::read_meshtags(const mesh::Mesh<double>& mesh, std::string name,
   md::mdspan<const std::int64_t, md::dextents<std::size_t, 2>> entities_span(
       entities1.data(), eshape);
   std::pair<std::vector<std::int32_t>, std::vector<std::int32_t>>
-      entities_values = xdmf_utils::distribute_entity_data<std::int32_t>(
+      entities_values = io::distribute_entity_data<std::int32_t>(
           *mesh.topology(), mesh.geometry().input_global_indices(),
           mesh.geometry().index_map()->size_global(),
           mesh.geometry().cmap().create_dof_layout(), mesh.geometry().dofmap(),