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Opens #4562

This reverts commit 9f9a2289.

we don't need to join the sample_set table, since we already have all
the data we need

add a terminating "#" character to identify if group_concat had
truncated data in a way that makes it malformed, and discard it.

count the sets and sequence files created in parent group because
otherwise the information is not accessible

for easier recognition in func tests

This reverts commit 50b477ef.
the MySQL SUUBSTRING function is not compatible with SQLite used in
tests

it was causing a conflict with the tag controller