[FIXED] @setcam=n doesn't set the issuing object as the primary value provider for @setcam_avdist distance

[FIXED] RenderResolutionDivisor is applied twice when the debug setting value is changed (but not on initialization)

[FIXED] Crash when @setsphere is issued with ALM enabled without shadows, ambient occlusion, depth of field, or antialiasing

[FIXED] @sitground=force from an object holding the only @sit=n,unsit=n reports the avatar standing and sitting illegally

Older how_to floater is not set to persist in between sessions and gets stuck, ranamed new how_to into guidebook to avoid the issue

following promotion of DRTVWR-525

Add support for multiple overlays in the same linkset (and support permanence in @setoverlay restrictions that aren't currently active)