Added the bp_tree::equal_range() public method.

Using (faster) pdqsort from Boost.Move for bulk inserts.
Using automatic minimal-size deduction for node_size_type.
Optimized the core find() function.
Various fixes around the pass_in_reg machinery.
Made use_linear_search_for_sorted_array actually user specializable by converting it into a variable.
Switched to using a smaller node size (with a brief comment).
Fixed bulk_insert_prepare() for empty input.
Fixed bulk_insert_into_empty() handling of short input sequences.
Fixed node_count_required_for_values() logic.
Fixed handling of an edge case in the bulk insert helper merge() function.
Added basic benchmarking.

CMakeLists.txt

@@ -23,11 +23,15 @@ set( boost_ver boost-1.86.0 )
 CPMAddPackage( "gh:boostorg/static_assert#${boost_ver}"   ) # Boost::core dependency
 CPMAddPackage( "gh:boostorg/throw_exception#${boost_ver}" ) # Boost::core dependency
 CPMAddPackage( "gh:boostorg/config#${boost_ver}"          ) # Boost::core dependency
+CPMAddPackage( "gh:boostorg/intrusive#${boost_ver}"       ) # Boost::container dependency
 CPMAddPackage( "gh:boostorg/io#${boost_ver}"              ) # Boost::utility dependency
 CPMAddPackage( "gh:boostorg/type_traits#${boost_ver}"     ) # Boost::utility dependency
 CPMAddPackage( "gh:boostorg/predef#${boost_ver}"          ) # Boost::winapi dependency
 CPMAddPackage( "gh:boostorg/assert#${boost_ver}"          )
+CPMAddPackage( "gh:boostorg/container#${boost_ver}"       ) # used only for comparative benchmarking
 CPMAddPackage( "gh:boostorg/core#${boost_ver}"            )
+CPMAddPackage( "gh:boostorg/integer#${boost_ver}"         )
+CPMAddPackage( "gh:boostorg/move#${boost_ver}"            )
 CPMAddPackage( "gh:boostorg/preprocessor#${boost_ver}"    )
 CPMAddPackage( "gh:boostorg/stl_interfaces#${boost_ver}"  )
 CPMAddPackage( "gh:boostorg/winapi#${boost_ver}"          )
@@ -72,8 +76,11 @@ endif()
 include( vm.cmake )
 
 target_link_libraries( psi_vm PUBLIC
+  Boost::container
   Boost::core
   Boost::assert
+  Boost::integer
+  Boost::move
   Boost::preprocessor
   Boost::stl_interfaces
   Boost::winapi