ksconf promote - new destination file should still allow interactive selection

[lowell80]

Example:

ksconf promote local/inputs.conf default/

if defaults/inputs.conf is missing, the file is simply moved into place. However,

touch default/inputs.conf
ksconf promote local/inputs.conf default/

Results in the user being prompted to pick which stanzas to promote. I think the second behavior is preferable, as it may not be desirable to promote all stanzas.