Go 1.7 released

Version 1.7 of the Go languagehas been released. "There is one tiny language change in thisrelease. The section on terminating statements clarifies that to determinewhether a statement list ends in a terminating statement, the 'finalnon-empty statement' is considered the end, matching the existing behaviorof the gc and gccgo compiler toolchains." On the other hand, thereappear to be significant optimization improvements; see the release notes for details.