Merge branch 'master' of https://github.com/3dem/relion

Use click<8.2.0 (GitHub issue #1301 reported by @huwjenkins)

going stable to version 5.0.0

Also update README.md

Merge branch 'master' of github.com:3dem/relion-devel into ver4.0

Merge branch 'ver3.1' into ver4.0

RELION 3.1.4: This is the final release for 3.1.x.

RELION 3.1.3

Fix typos

Import: "../" should not happen in any place