Abfrage der Halbjahre in LendingViewModel eingebaut.
Betroffene Entities entsprechend angepasst.
Aktuelles Schuljahr wird ermittelt
Merge branch 'upstream/develop' into issue#280-LendingVMmitHJ

Conflicts:
	src/main/java/de/dhbw/humbuch/model/entity/SchoolYear.java
Set window modal and removed removeExistingWindow()
If no teaching material is selected show a notification instead of NP
Merge pull request #312 from Junkern/issue#311

Set window modal and removed removeExistingWindow()
added method for retrieving a single entity with indicated criteria,
changed return types in DAO and DAOImpl from Collection to List, added
JavaDocs comments
Merge pull request #313 from Junkern/issue#309

If no teaching material is selected show a notification instead of NP
Merge pull request #315 from davherrmann/issue#314

added method for retrieving a single entity with indicated criteria,
cleanup
Merge pull request #317 from davherrmann/issue#170

cleanup in MainUI
Category toString()-Methode hinzugefügt
Das Halbjahr des TeachingMaterial wird nun als Enum gespeichert
SchoolYear entsprechend des neuen TeachingMaterial angepasst
BookManagementView und ViewModel auf geänderte TeachingMaterial Entity
angepasst
Merge branch 'upstream/develop' into issue#280-LendingVMmitHJ

Conflicts:
	src/main/java/de/dhbw/humbuch/view/BookManagementView.java
	src/main/java/de/dhbw/humbuch/view/components/PrintingComponent.java
SQL-Skripts angepasst
bugfix in LendingViewModel
Merge pull request #318 from davvitt/issue#280-LendingVMmitHJ

Issue#280 lendingVM mit Berücksichtigung der Halbjahre
DB Passwort aus entfernt ...