Merge branch 'jc/show-untracked-false'

The status.showUntrackedFiles configuration variable had a name that tempts users to set a Boolean value expressed in our usual "false", "off", and "0", but it only took "no". This has been corrected so "true" and its synonyms are taken as "normal", while "false" and its synonyms are taken as "no". * jc/show-untracked-false: status: allow --untracked=false and friends status: unify parsing of --untracked= and status.showUntrackedFiles