Merge branch 'f-external-ids' into 'dev'

CHANGELOG.md

conf/core/jobs.csv

conf/core/server.conf

pom.xml

src/main/java/org/caosdb/datetime/FragmentDateTime.java

src/main/java/org/caosdb/datetime/UTCDateTime.java

src/main/java/org/caosdb/server/CaosDBServer.java

src/main/java/org/caosdb/server/accessControl/Pam.java

src/main/java/org/caosdb/server/caching/JCSCacheHelper.java

...n/java/org/caosdb/server/database/BackendTransaction.java

...ava/org/caosdb/server/database/DatabaseAccessManager.java

...ava/org/caosdb/server/database/access/AbstractAccess.java

src/main/java/org/caosdb/server/database/access/Access.java

.../backend/implementation/MySQL/DatabaseConnectionPool.java

.../database/backend/implementation/MySQL/DatabaseUtils.java

...end/implementation/MySQL/MySQLDeleteEntityProperties.java

...backend/implementation/MySQL/MySQLDeleteSparseEntity.java

...ckend/implementation/MySQL/MySQLGetDependentEntities.java

...ackend/implementation/MySQL/MySQLGetFileRecordByPath.java

...tabase/backend/implementation/MySQL/MySQLGetIDByName.java