Openpyxl22
closes #10125 

I've added preliminary tests for openpyxl >= 2.2 styles. Unfortunately, I don't know how to get a whole test class to be skipped so tests will only run with either the Openpyxl20 or Openpyxl22 test class disabled, depending upon which version is installed. I hope this can be fixed fairly easily. Some code somewhere is still calling `openpyxl.styles.Style()` which needs changing. The aggregate Style object is an irrelevancy in client code.
