------------------------
**Bugfixes**
- Fixed naming of WDM ``alter_dndm`` to ``alter_model`` to be consistent.
- Fixed bug which made CAMB transfer function not pickleable or copyable.
.. note:: the fix is not perfect -- if you provide a custom CAMBparams class
to ``transfer_params``, it is not certain that results will be consistent,
as a few of the attributes of this object are not pickleable, and thus
are ignored.