doc/phoenix3/qbk Update version to 3.1.0 and quickbook to 1.6 with compatibility to 1.3
doc/inside/actor.qbk Correct error in reference
doc/phoenix3.qbk Add a comment on current date.
doc/what_s_new.qbk Add new sections for 3.0.6 and 3.1.0
Merge branch 'documents' into develop