upgrading to 3.6.2

(cherry picked from commit 70a4ca75f7462f192f92355c0b4c66731a7a1b6a)
attempted doc fix

(cherry picked from commit 85b30a5c719518bd84b5e43ca16f8023d3aa1aef)
fix tar.gz link

(cherry picked from commit c26159ee99b5091b33c55378e880bf6b0b2af12d)
Merge pull request #938 from pasinskim/3.6

3.6 ha documentation
Modify PostgreSQL archiving configuration needed by HA.
(cherry picked from commit 398b26a983aaf9e498e13d62a9b779ec87cfdfe6)