Updated testlog_parser.py to the latest version from the private repo.
Added a new and improved version of the XLS report generator.
In the XLS report, enabled word wrapping for header cells.

Otherwise, Excel ignores line breaks in them.
Made the order of tests in XLS reports deterministic.
Made xls-report.py ignore tests that were not successful.
Merge pull request #1016 from SpecLad:xls-report