Merge branch 'f-refactor-transactions' into 'dev'

CHANGELOG.md

pom.xml

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

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

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

...main/java/org/caosdb/server/database/DatabaseMonitor.java

...er/database/backend/implementation/MySQL/MySQLHelper.java

...database/backend/transaction/DeleteEntityTransaction.java

...database/backend/transaction/InsertEntityTransaction.java

...atabase/backend/transaction/InsertTransactionHistory.java

...se/backend/transaction/RetrieveFullEntityTransaction.java

...aosdb/server/database/backend/transaction/RuleLoader.java

...database/backend/transaction/UpdateEntityTransaction.java

src/main/java/org/caosdb/server/entity/FileProperties.java

src/main/java/org/caosdb/server/entity/InsertEntity.java

src/main/java/org/caosdb/server/entity/WritableEntity.java

...a/org/caosdb/server/entity/container/DeleteContainer.java

...a/org/caosdb/server/entity/container/InsertContainer.java

...a/org/caosdb/server/entity/container/UpdateContainer.java

...org/caosdb/server/entity/container/WritableContainer.java