moving Nuke *.chan io camera animation import/export scripts into trunk, this is a very simple foramt and nice to have with tracking release

[[Split portion of a mixed commit.]]

from ed gautier (edddy) 

Dear all.

Some large data classes (elements, atoms and sticks) use 

           __slots__

now.


Cheers,

Blendphys.

Moving PDB importer into trunk,

thanks to Clemens Barth for making all edits requested to have this in an acceptable quality level.

There are a few todo's still but at this point the script is better then the previous PDB importer in trink, so better to include this in the 2.61 release.

[[Split portion of a mixed commit.]]

removing this PDB importer in preparation to replace with a re-written one which supports more file types

Fixed Bug in Bolt Factory “remove doubles” function, which was introduced during indentation clean up.

indentation edits and copy pyrimid from contrib (where I had made some edits), removed so this wont happen again.

- Added a button for copying render settings from Blender render due to a bug involved if changing render engine from the render engine menu instead of the button
- Removed debug prints

fix error when sending thumbnail to master

The fracture object was always created on layer 1 only (when this layer is not visible, ops.object.editmode_toggle hence failed). Now creating the fracture objects on current active layer(s).

from Filiciss Muhgue (filiciss)

Fix for #26867

Hunted down and debugged with great help from Geoff Murphy

In convert_lens() changed 'try' test to 'hasattr' test (Campbell Barton's suggestion, thank you), added '_' between prefix and ob_name to get more readable layers' names in AE, plus minor spelling corrections.

modified def convert_lens to behave correctly when camera sensor fit is set to vertical.\nPrevious version worked accurately only when 'AUTO' or 'HORIZONTAL' sensor fit was used.\nPreserved compatibility with 2.60a not supporting camera sensor size.

- Removing our hardcoded redraw of the render panel due to issues with Cycles and modified render panels. If anyone knows how to append a button into an existing panel, do tell me. Alternatively, adding a panel to the top of a properties page.

- Fixed a bug with the cancel button never triggering due to checking the wrong list of sessions

by Mariusz Maximus & Jong89

(yes sir, it is a bugfix :P ).