REL: prepare release 7.0.1

See merge request !22

F mariadb 48

See merge request !21

BUG: Broken FIND {id}

See merge request !20

Release 6.0.1

See merge request !19

Fix Restore

See merge request !18

Release 6.0

Closes caosdb/internal/all#650 and caosdb/internal/all#526

See merge request !17

External String IDs

See merge request !15

Merge branch 'f-external-ids' of gitlab.indiscale.com:caosdb/src/caosdb-mysqlbackend into f-external-ids