Quickbook: Merge from trunk to quickbook-dev.

svn path=/branches/quickbook-dev/boost/signals2/; revision=75779
Quickbook: Merge from trunk to quickbook-dev.

svn path=/branches/quickbook-dev/boost/signals2.hpp; revision=75846
Quickbook: Merge from trunk to quickbook-dev.

svn path=/branches/quickbook-dev/boost/signals2/; revision=76255
Quickbook: Merge in rev. missed before

svn path=/branches/quickbook-dev/boost/signals2/; revision=76256
Quickbook: Merge to quickbook-dev

svn path=/branches/quickbook-dev/boost/signals2.hpp; revision=76630
Quickbook: Merge to quickbook-dev

svn path=/branches/quickbook-dev/boost/signals2/; revision=76636
Quickbook: Merge from trunk.

Includes blocks in lists fixes, and some documentation changes.

svn path=/branches/quickbook-dev/boost/signals2/; revision=77347
Quickbook: Merge from trunk.

svn path=/branches/quickbook-dev/boost/signals2/; revision=77380