Merge pull request #698 from shamanas/98x

Fix windows build
Fix windows build
Bump version to 0.9.7a, for Windows fix
Changelog for 0.9.7a
Merge with master
Don't print ref if it's null in -vv
Ooh..
Error messages / debug improvements / crash avoidance
Better toString for flowControl
Time stuff
Rock now throws an error if we are trying to return something in a void function (conspiracy backport)