Change 0.7.6.1 flavour to release
Change 0.7.6-post-fixes branch back to Post_Fixes flavour
If a caller tries to queue a CAPs message to a scene presence that has no event queue (e.g. an NPC), only warn if event queue debugging is greater than zero.

Removes the spurious log warnings if groups are active when NPCs are used.
Adds more regression tests associated with adding messages to the event queue
Reassert extended branch version flavour again after merge from 0.7.6-post-fixes
Revert "Reassert extended branch version flavour again after merge from 0.7.6-post-fixes"

This reverts commit 2a482c22bcbfbda043e050414ea19f33ce3e079d.
Merge branch '0.7.6-post-fixes' into 0.7.6-extended