Rename JobExecutionTime->TransactionStage, +Docs

src/doc/development/structure.rst

src/main/java/org/caosdb/server/jobs/Job.java

src/main/java/org/caosdb/server/jobs/JobAnnotation.java

src/main/java/org/caosdb/server/jobs/Schedule.java

src/main/java/org/caosdb/server/jobs/ScheduledJob.java

src/main/java/org/caosdb/server/jobs/TransactionStage.java

src/main/java/org/caosdb/server/jobs/core/AccessControl.java

src/main/java/org/caosdb/server/jobs/core/Atomic.java

src/main/java/org/caosdb/server/jobs/core/CheckParValid.java

...main/java/org/caosdb/server/jobs/core/CheckPropValid.java

...ava/org/caosdb/server/jobs/core/CheckStateTransition.java

src/main/java/org/caosdb/server/jobs/core/DebugCalls.java

src/main/java/org/caosdb/server/jobs/core/ExecuteQuery.java

src/main/java/org/caosdb/server/jobs/core/History.java

...java/org/caosdb/server/jobs/core/InheritInitialState.java

...java/org/caosdb/server/jobs/core/InitEntityStateJobs.java

...in/java/org/caosdb/server/jobs/core/InsertFilesInDir.java

...va/org/caosdb/server/jobs/core/LoadContainerFlagJobs.java

...in/java/org/caosdb/server/jobs/core/MakeStateMessage.java

...n/java/org/caosdb/server/jobs/core/MakeStateProperty.java