Suggested by Jurek Jurka at Linus Pauling Instute. Renamed all functions with lower case letters and spaces rather than dashes, to make it more readable. If some sequences were shorter than others, towards the end, the percent was calculated on the number of original sequences, not just the sequences which had data at this position. When you delete positiions, the deleted bases will be placed into a yank buffer. Adjacent deletions will concatenate into one contiguous yank.
All delete functions affect the yank buffer.
The YANK functions were suggested by Yurek Yurka.