Release v2.47

Merge pull request srvrco#741 from srvrco/release2.46

Release 2.46

Merge pull request srvrco#719 from srvrco/timkimber/issue717

Fix upgrade url issue

Merge pull request srvrco#719 from srvrco/timkimber/issue717

Fix upgrade url issue

Merge pull request srvrco#715 from srvrco/fix-preferred-chain-arg

Fix -preferred-chain argument (srvrco#712)
Show help if no domain specified (srvrco#705)

Change upgrade to use latest release instead of latest commit

Tag fix

Suppress test failure when release description contains "error"

Upgrade test checks for "error" in output.

But release descriptions can have "fix error in ..."

Don't run this check.  Checking that a new version is detected suffices.

Prefer API V2 when both offered in a single directory

This doesn't happen with Let'sEncrypt, but it does with at least
one other CA.  The ACME spec allows it.

Merge pull request srvrco#685 from tlhackque/master

Fix copy_file_to_location failures with ssh, missing ftps:https://