tcp analysis updates to prepare for later tcp reassembly updates

now that we have se_tree_lookup32_le   we can do the tracking of pdu boundaries much more efficiently.

track pdu boundaries by a new  tcp_multisegment_pdu  structure that is indexed by sequence numbers and let this structure replace the older tcp_next_pdu structure.

with se_tree_lookup32_le  we no longer need to track segment by segment and can get rid of the two hash tables
tcp_pdu_tracking_table
tcp_pdu_skipping_table
Neither do we need the tree   tcp_pdu_time_table anymore so that one is gone as well.

remove various other functions that are no longer needed due to removing the structure and the tables/tree


this part of the code shoul;d be much more readable now   and also a bit faster



svn path=/trunk/; revision=18024

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