DDSPSMC — read/take consistency for loaned and non-loaned samples

The current DataReader API provides a slightly different API for getting samples when loaning the data vs. when providing user storage.

When loaning the data the data and the SampleInfo is encapsulated on a Sample type, while when providing user storage two different containers hold the data and the SampleInfo.

For consistency the two API should encapsulate the data and the SamplInfo on the Sample data structure.

This issue raises a relevant consistency issue. All the operations on the DataReader have been revised to consistently use the Sample type to hold both sample data and sample info.