[Bf-python] Making IK flag writable in the Bone class

[Jonas Petersen]

Hi everybody!

I hope this ist the right place to post this...

The IK flag in the Bone python class is read only. The only way to 
modify it is the corresponding button in the buttons panel. It's not 
possible via python.

I modified  python/api2_2x/Bone.c so the flag can be modified via python.

For now I did it by adding an optional bool parameter to the hasIK() 
function that sets/unsets the flag.

An alternative or additional way would be to make the IK class member 
variable writeable.

What do you think?

I could supply a patch if desired.

Regards,
Jonas