make blueprint helpers available to multiple source files (#713)

* * Testing out adoption of initializer lists in Blueprint helper code.

* * Abstracted advanced functionality from 'conduit_blueprint_mesh' into 'conduit_blueprint_util_mesh'.

* * Refactored the 'blueprint::util::mesh::coordset' functions to eliminate the unused 'coords' function.
* Integrated the 'blueprint::util::mesh' constants into the BP meshing test cases.
* Made all of the 'blueprint::util::mesh' constants all caps to match Conduit convention.

* * Added 'blueprint_util_o2mrelation' module to serve as equivalent to 'blueprint_util_mesh' module.

* * Refactored 'offsets' Blueprint utility functions to just const and non-const 'generate_offsets'.
* Added regression tests for the new public Blueprint query functions in 't_blueprint_mesh_query.cpp'.

* * Changed 'blueprint::util::{mesh|o2mrelation}' to 'blueprint::{mesh|o2mrelation}::util'.'

* * Moved 'blueprint::{mesh|o2mrelation}::util' to 'blueprint::{mesh|o2mrelation}::utils'.

src/libs/blueprint/CMakeLists.txt

@@ -19,12 +19,14 @@ configure_file ("${CMAKE_CURRENT_SOURCE_DIR}/conduit_blueprint_exports.h.in"
 set(blueprint_headers
     conduit_blueprint.hpp
     conduit_blueprint_mesh.hpp
+    conduit_blueprint_mesh_utils.hpp
     conduit_blueprint_mesh_examples.hpp
     conduit_blueprint_mesh_examples_julia.hpp
     conduit_blueprint_mesh_examples_venn.hpp
     conduit_blueprint_mcarray.hpp
     conduit_blueprint_mcarray_examples.hpp
     conduit_blueprint_o2mrelation.hpp
+    conduit_blueprint_o2mrelation_utils.hpp
     conduit_blueprint_o2mrelation_iterator.hpp
     conduit_blueprint_o2mrelation_examples.hpp
     conduit_blueprint_zfparray.hpp
@@ -47,13 +49,15 @@ set(blueprint_c_headers
 set(blueprint_sources
     conduit_blueprint.cpp
     conduit_blueprint_mesh.cpp
+    conduit_blueprint_mesh_utils.cpp
     conduit_blueprint_mesh_matset_xforms.cpp
     conduit_blueprint_mesh_examples.cpp
     conduit_blueprint_mesh_examples_julia.cpp
     conduit_blueprint_mesh_examples_venn.cpp
     conduit_blueprint_mcarray.cpp
     conduit_blueprint_mcarray_examples.cpp
     conduit_blueprint_o2mrelation.cpp
+    conduit_blueprint_o2mrelation_utils.cpp
     conduit_blueprint_o2mrelation_iterator.cpp
     conduit_blueprint_o2mrelation_examples.cpp
     conduit_blueprint_zfparray.cpp