Changes for release 2.16.8

[sdottaka]

Changes for release 2.16.8

• New feature: Table compare
• Add per-user installer (WinMerge-2.16.8-x64-PerUser-Setup.exe)
• Rename ChangeLog.txt to ChangeLog.html
• Change WinMerge2011's URL from https://bitbucket/jtuc/winmerge2011 to https://github.com/datadiode/winmerge2011

@gerundt The binaries have already been uploaded to sourceforge.net. If you find any weird changes, I would appreciate it if you could point out or fix them.

[sdottaka]

Thank you for updating the web pages!