PointCloud.copy, landmark copy.
Copy pointcloud on landmark set

Add tests for this, fix a few pieces of ugly code
Add the trimesh copy function
Copy false on pyramind building
Propagate kwargs through init with channel
Pointless enumerate
Fix bugs in fittingresult base class and add tests
Doc updates in FittingResult
Remove deep copys
Add copy function to images

Copies pixels and landmarks by default
Add copy kwarg to textures and coloured meshes
Add copy methods to trimesh

Also add some tests for it
Add test for pointcloud copy method
Add tests for landmark copying
Fix the arguments in texturedtrimesh tests

Trilist is optional! so pass as kwarg
Merge remote-tracking branch 'upstream/master' into copy
Merge remote-tracking branch 'upstream/master' into copy
Merge remote-tracking branch 'origin/copy' into copy
docs on the image copy methods
copy() on homog family (needs tests)