Thread: Added shared_future::then doc.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84544 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fixes #8277

git-svn-id: http://svn.boost.org/svn/boost/trunk@84545 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fixes #7952

git-svn-id: http://svn.boost.org/svn/boost/trunk@84546 b8fc166d-592f-0410-95f2-cb63ce0dd405
Minor fix for multiprecision types.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84547 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread added shared_future::then tests.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84548 b8fc166d-592f-0410-95f2-cb63ce0dd405
geometry extensions: Added rotation_quaternion, rotation(), transform_geometrically(), etc.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84549 b8fc166d-592f-0410-95f2-cb63ce0dd405