Add manpage in mdoc format
Merge after !38 (merged).
Moves program invocation details from README to pdf.1.mdoc.
Includes the generated ASCII output for convenience. Make sure to regenerate with 'make doc' after changing the mdoc source.
Pro forma MR. OK:
2023-01-13 08:08 <meg> pesco: manpage branch looks good to me
Edited by Sven M. Hallberg