text2pcap: Support parsing of iso-8601 dates
strptime does not support parsing of iso-8601 formatted time strings on all platforms. Add a magic ISO format string parameter to then use iso8601_to_nstime from wsutil.
Some manpage updates clarifying the -D and -t parameters and referencing strftime instead of strptime as on BSD the format parameters are only described by the strftime manpage.
Edited by Jörg Mayer