constructors (Re: [Bf-python] More Proposed API changes.)

[Campbell Barton]

> so what is this? from 
> http://members.optusnet.com.au/cjbarton/BPY_API/Bpy-module.html
> ob = scn.objects.new(me) # new object from the mesh
> 
> a bug in the example or the doc? is the 'objects' thing different from 
> the other collections, but that is undocumented?
> 
> ~Toni
> 

nope, this is intended. a scenes.objects is similar to bpy.objects, but 
it has context as well

scn.objects.selected
scn.objects.context # visible and selected
scn.objects.active

new objects are only created through the scene at the moment,
ob = bpy.objects.new() is possible but we'v discussed and it seems that 
having an object without a scene should be discouraged.