Assorted changes from Ronnie Sahlberg:

Assorted changes from Ronnie Sahlberg:

	Add a few small functions to reassemble.c to cope with protocols
	where the total length of defragmented PDUs are specified in the
	first fragment (all previous uses of reassembly has been for
	PDUs where the last fragment is signalled by a flag in the
	header for the last fragment).

	Add a few small functions to reassemble.c to abort-and-delete
	defragmentation of PDUs and also detect IF a PDU is currently
	being defragmented.  (Useful for PDUs where the "unique"
	identifier is rather ununique, or may be reused often enough so
	it can be a problem for Ethereal.)

	Change where NT Cancel presents its Cancelation-to output, and
	makes the three trans secondary requests also output similar
	information.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@4255 f5534014-38df-0310-8fa8-9805f1628bb7