Possibility to specify a prefix in WorkflowDatabaseExecution if executionId given. Fix as suggested by José Moreira in https://jira.ez.no/browse/EZC-16096
Fixed: Some queries are not taking into consideration the ezcWorkflowDatabaseOptions prefix option. Variation of the patch suggested by José Moreira at https://jira.ez.no/browse/EZC-16095
Test verifying that 85804aa works
Restored unit testing with phpunit (instructions included)
Merge branch 'db-prefix-issues-fixed' into awaiting-prs