Branch for 1.6 release.


git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.6@8708 ddefafc4-47db-0310-ae44-fa13212b10f2
Merge some changes from main.


git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.6@8715 ddefafc4-47db-0310-ae44-fa13212b10f2
Adding release notes.


git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.6@8716 ddefafc4-47db-0310-ae44-fa13212b10f2