Log Message:
Changes 1.56.0:
Modularization
Boost version control has migrated to a system using git submodules. This \ 
shouldn't make too much of a difference to users, although the directory \ 
structure is now a bit different.

Parts of some libraries have been moved into different modules, and several new \ 
modules have been extracted from existing code. All header paths should remain \ 
the same. The new modules are:

Assert:
Customizable assert macros. Maintained by Peter Dimov.
Core:
Core utilities used by other libraries, with minimal dependencies. Maintained by \ 
Peter Dimov, Glen Fernandes and Andrey Semashev.
Lexical_Cast:
General literal text conversions, such as an int represented a string, or \ 
vice-versa, from Kevlin Henney.
Throw_Exception:
A common infrastructure for throwing exceptions from Boost libraries, from Emil \ 
Dotchevski.
Winapi:
Windows API declarations without <windows.h>, for internal Boost use.
New Libraries
Align:
Memory alignment functions, allocators, and adaptors, from Glen Fernandes.
Type_Index:
Runtime/Compile time copyable type info, from Antony Polukhin.