Version 2.4.7 - April, 2020

• Backport of selected fixes from 3.0.0 work:
  . Each bug with Regex expressions
  . And expressions not properly constructing with generator
  . Traceback abbreviation
  . Bug in delta_time example
  . Fix regexen in pyparsing_common.real and .sci_real
  . Avoid FutureWarning on Python 3.7 or later
  . Cleanup output in runTests if comments are embedded in test string