Simplified XgetRootdir.
Updated dagaddr to recognize user defined XIDs.
Updated xroute to recognize user defined XIDs.
Make click recognize user defined XIDs.
Added example user defined XID conf file.
Removed debug code.
Added instructions on how to add an XID.
Forgot to check for non-existant file.
Reject IP packets not destined for us when running in 4ID mode.
MakeSpace function was deleting the wrong data.

Error was found by students at Tonji University.
Moved unused DNS code to experiments directory.
Added default fallback step for adding a new XID.
Merge branch 'extend' into develop
Added link to the new XIA Wireshark location.
Merge branch 'develop' into intrinsic_security

Conflicts:
	click-2.0.1/conf/xia_router_lib.click

Resolved manually:
Mostly whitespace issues. There are extra arguments to the line cards
and that is the only code changes done in this changeset.