miniupnpd/minissdp.c: check return value of AddMulticastMembershipIPv6()
miniupnpd.c: comments in parselanaddr()
miniupnpd: removed unused code

ScanNATPMPforExpiration() CleanExpiredNATPMP() are not used anymore
miniupnpd: define min/max_lifetime only when needed
miniupnpd: various PCP fixes
miniupnpd:  PCP Add support for ANNOUNCE requests