BS-10273 : As Dave, I need to know about the Actor API

- Update javadoc
Fix bad link on javadoc
BS-11387,  update javadoc
Merge branch '6.4.x' of github.com:bonitasoft/bonita-engine into 6.4.x
BS-10104 : As Dve, I need to know about the Data package

- Add/Update javadoc
Removed typo-named folder
BS-10271 : As Dave, I need to know about the Engine API

- Update the javadoc
Inlude stack trace of connector exception in log message produce with ERROR level. Don't do it anymore under DEBUG level only. Update unit test and confirm fix with an "upgraded" 6.4.0 version (community edition)
Fixed Java version required to build Engine in README.md file
BS-10274,  update javadoc for BusinessArchive
BS-10274,  update javadoc for BusinessArchive
BS-10272, update javadoc
BS-11699, when getting custom data from a call activity, use the parent
class loader instead of the child one
BS-9707 : org.bonitasoft.engine.process.ProcessExecutionTest.checkStartAndEndDate

- Replace old waiting mechanism by the new (event)
- Move somes tests
- Replace integration tests by unit tests
BS-9821 : org.bonitasoft.engine.process.GatewayExecutionTest.inclusiveSplitThenExclusiveMerge | inno1 | bos-engine-all-tests / mysql

- Replace old waiting mechanism by the new (event)
BS-9740 : com.bonitasoft.services.monitoring.SServiceMXBeanTest.getExecutingJobsTest (from com.bonitasoft.services.AllTestsSPWithJNDI) | inno1 | 14/08

- Move the code of the Initializer & Runner of Bonita to use it on the integration service tests
- Modify the integration service tests to use the Initializer & Runner of Bonita
BS-11901 : Fix unstable test TimerEventSubProcessTest.subProcessCanAccessParentData

- Replace the old waiting mechanism (request in database) by the new (event)
BS-11862, fix registering of job listeners. Cause: listeners were not registered when the scheduler was already started. Fix: ensure that listeners are always registered before scheduler start
Replace the old waiting mechanism (request in database) by the new (event)
BS-11739, add unit tests