New ignorecommand that is added to the ignoreip list from output of an external program

ignorecommand update man and fix protocol help

ENH: run ignore command only after internal list has been examined. Change interface on ignorecommand to take IP as environment variable and return true if it is to be banned

ENH: ignore IP command to take tagged command

DOC: man pages for ingorecommand

TST: add test cases for ignorecommand