Also update the maximum channel length to 4 in IAGA2002Writer to
allow for the use of 'DIST' as a channel.

Fixed odds and ends,  and made convert_stream_to_masked, and _convert_trace_to_int non destrutive calls

Refactored code to put one channel at a time,  instead of one trace at a time, to fix a problem with writing to edge. Added logic to use cwbhost/cwbport if data is older then 10 days, and the cwbhost/cwbport are provided. Added starttime/endtime to put_timeseries to match algorithm base class. Other cleanup as discovered.

Completed comments.  Changed _send_trace to _put_trace, and moved RawInputClient initialization and close into _put_trace.  Added routines to change a trace to a masked array, and change channels into int.