Change grouping behaviour for grouping="instrument" (Closes #196) #217
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Instead of separating instruments with different channel codes into different groups, they are now put into the same group, e.g., BH? and HH? are now in the same group. The grouping key is NET.STA.LOC. This change is necessary for many OBS deployment, where the channel codes aren't identical between the hydrophone and the seismic sensor.