Set miniseed reclen to 512 bytes

Remaining changes needed for miniseed output to seedlink.

added 7 commits

• 2acab3fc...5f257571 - 6 commits from branch ghsc/geomag:master
• fd275dce - Set miniseed reclen to 512 bytes

Compare with previous version

added 3 commits

• fd275dce...5c74996d - 2 commits from branch ghsc/geomag:master
• b8a0022a - Set miniseed reclen to 512 bytes

Compare with previous version

mentioned in commit d5f53e69

merged