Add protected overload to StreamSink to allow specifying the base path

[glopesdev]

The StreamSink abstract class provides a protected method for generating the stream logging observable. Currently this operator only allows using the Path property as the base file name to the generated stream.

bonsai/Bonsai.System/IO/StreamSink.cs

Line 109 in c602b54

protected IObservable<TElement> Process<TElement>(IObservable<TElement> source, Func<TElement, TSource> selector)

Implementation of operators supporting demultiplexing of multiple streams would be supported by providing a new overload accepting a fixed path parameter to be used instead of the base property.