Remove TimeSeries

[kain88-de]

We discussed recently to remove the TimeSeries objects from MDAnalysis. As far as I know none of the core devs is using it. We also note that it is unlikely we will ever implement TimeSeries for any other readers besides dcd and memory and most of it's function can be replaced by the Analysis Framework.

The only part in the library that uses TimeSeries is encore. So it would be useful get some input from @wouterboomsma and @mtiberti before we go ahead with this.

As a first step I would remove timeseries from DCD during the cython transition.
In a later step we would remove timeseries from memory reader and remove the core TimeSeries class.

[kain88-de]

I should be more specific. This won't remove the timeseries call from MemoryReader. As this is only a view of the underlying array (useful to have). Only the fancy correl functions will be removed.

[wouterboomsma]

As far as I remember, the only reason Encore uses timeseries() was to maximize it's similarity to other Readers. So I don't think there should be any problems removing it. However, I think it would make sense to keep the functionality (perhaps with a different name) within MemoryReader, because it is an intuitive interface to extract a numpy array in a specified format.

[wouterboomsma]

Ups... Posted before seeing your follow-up message. It seems we agree.

[wouterboomsma]

If we keep the timeseries() method in MemoryReader, your suggested change would probably not require any modifications in Encore at all - because encore typically works on MemoryReader readers anyway (calling transfer_to_memory if necessary).

[orbeckst]

This would also close #186.

[kain88-de]

So there is a general agreement to remove the correl like features?

[orbeckst]

Yes, I think everyone would like to move forward with removing it. I removed the proposal tag.