Issue #193: Use logical channel ordering in group summary (partial solution to eliminate masked bits and adjust the weight of the remaining bits)

Partial solution: eliminated the bits not selected by the mask by shifting to the right all the values selected bits (e.g.  data b0010 1010, mask b0101 1000, transformed value: b0000 0001). Although this solves the random offsets that appear due to skipped bits, it still keeps the natural bit order in the capture, ignoring the order in the visual configured signal group. To solve this, a remapping of the bits is required, but it might prove very time consuming.

Also included a workaround for eliminating inaccurate/fake long slopes between two distant different samples in the Analog Scope signal by using an intermediate point at the timestamp just before the current sample timestamp.
fixed analog sample averaging issue that could have appeared if sloppy drawing was enabled