Select Mass Position channels

Make MSeed and Reftek read according to the selected mass position 123/456 #22 (closed)

assigned to @kienle

added 2 commits

• a4ddd57f - documentation for selecting mass position
• d40d4f56 - use list comprehension

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@kienle I addressed your review. Can I merge it?

You can merge it now.

resolved all threads

approved this merge request

added 21 commits

• d40d4f56...9bd09727 - 20 commits from branch master
• dab9a9f7 - Merge branch 'master' into i22_masspos

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added 3 commits

• dab9a9f7...2a354444 - 2 commits from branch master
• 56b89288 - Merge branch 'master' into i22_masspos

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mentioned in commit e993d25d

merged