Upgrade the given objects.
This is a counterpart to `downgrade`.
Parameters
----------
objects: Part::Feature or list
A single object to upgrade or a list
containing various such objects.
delete: bool, optional
It defaults to `False`.
If it is `True`, the old objects are deleted, and only the resulting
object is kept.
force: str, optional
It defaults to `None`.
Its value can be used to force a certain method of upgrading.
It can be any of: `'makeCompound'`, `'closeGroupWires'`,
`'makeSolid'`, `'closeWire'`, `'turnToParts'`, `'makeFusion'`,
`'makeShell'`, `'makeFaces'`, `'draftify'`, `'joinFaces'`,
`'makeSketchFace'`, `'makeWires'`.
Returns
-------
tuple
A tuple containing two lists, a list of new objects
and a list of objects to be deleted.
None
If there is a problem it will return `None`.
See Also
--------
downgrade