Changes based on 3.10 code reviews

Add information about source linked PDB files

Merge pull request nunit#2554 from nunit/pull_TestFixtureData_SetName

Made TestFixtureData.SetName internal for 3.9 (see nunit#2538)

Fix spelling mistake that is already fixed in master

Update the CHANGES for the release

Changes for the 3.7.1 hotfix release

NUnit Framework 3.7 Release

Set date for 3.6.1 release

Update the copyright to 2017

Updating the release notes with final changes