Update tests for TS3.6

[DataTables]

It appears that the update to TS3.6 has broken the tests. This needed two changes:

• Move output comparison directory to reflect the 3.6 version
• TS3.6 uses four spaces in the .d.ts output

This PR addresses both points and the build is running through cleanly again.

[DataTables]

Sorry - I hadn't realised that bumping the version in my local repo would update this PR automatically. Undone now.

A new release with the change to allow composite builds with TS3.6 would be very welcome if possible :).

[ivogabe]

Thanks Allan! I've cherry-picked your first commit which is now on master. Looks like this was caused by merging multiple PRs.