Data may not be processed if chanfile isn't ordered

[ulbergc]

This is a bug. In the short term can be addressed by having the channel metadata file sorted by SCNL (not sure the exact order). It appears the problem arises in traceBuffer_ewrr_unpackTraceBuf2Messages() when variable imap is being filled.

An example of the problem can be seen in the 2018 Anchorage replay.

Solution should ensure all data are processed regardless of the metadata order or the order data are received.