I've simplified the residual resistance tables so that I can make progress

I reduced the amount of data that I need to generate for residual resistance tables, so that the work is more manageable. The drawback is that calculation accuracy is diminished, but could be improved by adding in data for more Speed-Length Ratios. I am using my handdrawn graphs from late 2002 to help with the data generation. The need filled is to extrapolate for values beyond those listed in The Speed and Power of Ships. The data most often used will be reasonably accurate, as some of the extrapolation is pretty low-risk. Where the values may never be used, as they are so extreme, the data is less reliable.