interpolate Data:😁umper output into strings for human consumption

Changes for 7.002

• 'l' method modifier omits quotes in vis() string result. Useqq("underscores") separates digits of large numbers. Useqq("hex") shows numbers in hexadecimal Useqq("octets") optimizes string display for binary data, e.g. show octal escapes and not \n \r etc.