* src/payprocd.c: Add option
* src/commands.c (connection_handler): Print the request in debug mode.
(write_data_line): Add debug output.
(write_data_line_direct): New.  Use instead of a direst es_fprintf.
(write_ok_line, write_ok_linef): Ditto.
(write_err_line): Ditto.
(write_rem_line, write_rem_linef): Ditto.