check the log modified time of an optional gziped log
Text::Iconv has a bug where it fails to reset the converter with a call to iconv(cd,NULL,(size_t) 0,NULL,(size_t) 0) if it fails during conversion; always create a new Text::Iconv object to work around this
encode all strings to bytes before including in estraier
accept -1 in addition to 0 for the current message in summary/outlook; properly handle control psuedoheaders