Fixes #1306 - Attempt to turn test suite names into better filenames.
Add notes for test report fix.
Merge pull request #1487 from sbt/wip/fr-1306

Fixes #1306 - Attempt to turn test suite names into better filenames.
Fixes #1375 - Check for empty filenames.

Starting sbt in root isn't a great idea, but it shouldn't break.
Add notes so we have a merge conflict.

Conflicts:
	notes/0.13.6.md