hledger/examples/invoicing/pandoc-make-invoice

Scripts adapted from a real-world setup, not guaranteed to be current or working. Normal usage:

1. make copy (copy last invoice to YYYYMMab.md, open in emacs)
2. edit the md file, pasting in appropriate numbers
3. make invoice (make YYYYMMab.pdf and YYYYMMab.html; git commit; print invoice journal entry)