compability with pvfactors 1.4

The pvfactors_timeseries function does not work with versions of pvfactors >= 1.3.

First reported in the pvlib google group

@anomam do you think it’s worth continuing to maintain this wrapper function? It seemed like it made sense in the early days of pvfactors but you’ve done a lot since then it’s not clear to me why people shouldn’t just use pvfactors directly.

[cwhanse]

@anomam I’ll second what @wholmgren says, that linking with pvfactors is worth doing. Several other bifacial modeling options are in the works #863 and #717, because there’s value in providing a variety of these models in a common framework. Please let me know if there’s something I could do to help here.

[anomam]

Ok, thanks @wholmgren . I will try to get started on this during the week or next week; unfortunately I can’t allocate work time to this anymore so I’ll try to do it one of these nights