_invoices_header => _header
rubycritic updated - doesn't work still
lacking partial to handle repeated 'no something or other message'. Added branch logic to output standing order instead of charge.
use case first draft
BUG CLEARFIX
Moved Invoicings New header code into its own partial
  - as lost sight about what the heading code is meant to be - the header - replaced empty row which was being used as a spacer.