Add options to show sub results in Summary Report

**Nicholas DiPiazza** ([Bug 66062](https://bz.apache.org/bugzilla//show_bug.cgi?id=66062&redirect=false)):
Add the ability to show Sub-SampleResults in the Summary Report

Could add options to control how they are added.

== 2 new user properties

Show sub results - true/false - default false - description: descends into sub-results, adding to the report recursively.
Sub results leaf only - true/false - default false - if showing sub results, then only add the Samples that have no child sub-results.

Version: Nightly
OS: All