Redmine#5271: pluck set_field_value
Redmine#5271: do not INFORM erroneously if setting an empty field to an empty value, just note it in VERBOSE
Merge pull request #1650 from tzz/redmine5271-set-empty-field

Redmine5271 set empty field
Rename shell script to .sh extension.
Introducing lastseen_threaded_load.