Merge pull request #859 from Arcticwolf/OPENENGSB-3663

[OPENENGSB-3663] improved model query performance
[OPENENGSB-3665] added EXBErrorHook hooks to the EKB PersistInterface
Merge pull request #860 from Arcticwolf/OPENENGSB-3665

[OPENENGSB-3665] added EXBErrorHook hooks to the EKB PersistInterface
[OPENENGSB-3669] make QueryRequest object specially aware of given contextIds
[OPENENGSB-3666] Added read/write lock mechanism to the graph db using class to avoid sporadicly occuring concurrent modification exceptions
Merge pull request #861 from Arcticwolf/OPENENGSB-3669

[OPENENGSB-3669] make QueryRequest object specially aware of given contextIds
Merge pull request #862 from Arcticwolf/OPENENGSB-3666

[OPENENGSB-3666] Added read/write lock mechanism to the graph db class
create edbi component
edbi: wip
edbi: wip