pp_parse_conf will receive the txt data read from conf file and will compile
the ppg->links structs. File open is supposed to be done outside the proper
parser here defined, so that any architecture, even those with no filesystems,
can make use of the parser, supposing the configuration txt data is saved
elsewhere (e.g. in a E2PROM)
Signed-off-by: Aurelio Colosimo <aurelio@aureliocolosimo.it>