Begin adding flush option for v4 and v6 pools.
Add flush operation to man page
Change arg letter
Add flush functions to userspace tool
Naive pool flush
when delete a valid ipv6 prefix from the userApp, the session entries that use the prefix will be erase from the session tables.
issue #97 The code was ready and made by @realloc, Added delete cascade when one of the pools were flushed or removed.
Merge branch 'feature/flush' of https://github.com/realloc/NAT64 into issue97

Conflicts:
	include/nat64/comm/config_proto.h
	usr/src/jool.c
	usr/src/pool4.c
	usr/src/pool6.c
Added the '--quick' option to the userspace app.
It was going to be called 'force', but there's nothing to force
since removing the pool address before its BIB and sessions
make it so the user doesn't have to try again ever, AFAIK.
Merge branch 'issue97' into fragments_experiment

Conflicts:
	include/nat64/comm/config_proto.h
	usr/src/jool.c

Also added the "quick" options to the userspace app's 'remove' and 'flush' operations.