Add I/O for masked Traces#49

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malcolmw wants to merge 4 commits intoSeismicData:masterfrom

malcolmw:dev/masked_trace_IO

Commits on May 19, 2018

Add I/O for masked Traces
Malcolm White
committed
Add I/O for masked Traces
Malcolm White
committed
Fix broken test
Malcolm White
committed

Commits on May 20, 2018

Add test for masked Trace I/O
Malcolm White
committed