[geometry] Add guidelines for developers and maintainers (not yet generated into docs). Content moved from http://trac.osgeo.org/ggl/wiki/Developer/Guidelines

git-svn-id: http://svn.boost.org/svn/boost/trunk@86710 b8fc166d-592f-0410-95f2-cb63ce0dd405
Add comments and fixes to FPU flags manipulation.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86711 b8fc166d-592f-0410-95f2-cb63ce0dd405