`api.add_entry` misses `is_partial` flag to create partial entries.

[mmaelicke]

@AlexDo1, what was your workflow so far to add partial entries using the API? Do I miss something, but it seems like that is not possible.

[AlexDo1]

That's true, the parameter isPartial is missing in api.add_entry().
Nevertheless, I used the isPartial parameter when I uploaded the eddy covariance data, and it looks like it worked then:

[mmaelicke]

Ok the is_partial is set over **kwargs, thus is is only about adding docs and a new argument to set it explicitly.