Make Builder mechanism thread safe by using factories and builders separately
Merge branch '6.1.x'

Conflicts:
	bpm/bonita-core/bonita-process-engine/src/main/java/org/bonitasoft/engine/execution/ProcessExecutorImpl.java
Fixed merge error
remove mybatis related things
remove unused variable in sequence manager
Change exception handling between server/client

Exception are modified only if in remote mode
we merge stack traces only before sending it to client and no more inside the BonitaException
remove uselesss transaction content
Fixed shade problem
Merge branch 'CoreProduct'