create model-interfaces:
* create interface AnalyseDateModel
* create interface BaselineModel
* create interface ConflictsModel
* create interface DependenciesModel
* create interface EmployeeCalendarModel
* create interface HolidaysCalendarModel
* create interface PlannedValueModel
* create interface ProjectModel
* create interface SemaphoreModel
* create interface WorkEffortModel
* create interface WorkpackageAllocationModel
* create interface WorkpackageModel
add javadocs to the interfaces
new data structure inserted
DBModelManager added
dummy classes added
Merge branch 'db-interface-defenition-initial' into PROJ-WS1314-WBS-DEV
ignoring some IntelliJ files