fix property numa

Merge pull request #324 from eoan-ermine/hash

Implement std::hash for boost::fibers::context::id

Merge pull request #315 from brad0/boost_fiber_futex_openbsd

Merge pull request #320 from xiaodaxia-2008/fix_dllimport_error

Merge pull request #322 from grafikrobot/modular

Split b2 dependencies into public and private.

Move inter-lib dependencies to a project variable and into the build targets.

Update copyright dates.

Bump B2 require to 5.2

futex: add support for OpenBSD

remove BOOST_FIBERS_DECL on function definition

Add requires-b2 check to top-level build file.

Add missing import-search for cconfig/predef checks.

Add missing NO_LIB usage requirements.