Release v3.1.1

• (mcm1957) "[E166] 'common.mode: extension' is unknown" has been fixed [#308]
• (mcm1957) "[E904] file iob_npm.done found in repository, but not found in .gitignore" removed as covered by [E503]. [#309]
• (mcm1957) "[E500] node_modules found" has been retricted to adapetr root. [#297]
• (mcm1957) Do not check main entry if common.mode none or extension.
• (mcm1957) Change "[W113] Adapter should support compact mode" text and honor common.compact set to false. [#300]