Started documentation of lendingview
Finished documentation of lending view.
Finished documentation of return view.
manuell ausgeliehene TeachingMaterials werden automatisch als received
markiert
neue Methode zum refreshen alles Students, wird für manuelle Rückgabe
gebraucht
Refactored and corrected lending and return view.
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	src/main/java/de/dhbw/humbuch/view/LendingView.java
	src/main/java/de/dhbw/humbuch/view/ReturnView.java
Added check whether a dunning can be closed
dunning table should update correctly for dunning status update
simplified states of DunningViewModel and DunningView
updated DunningVM tests to new state
Merge pull request #616 from davvitt/issue#609-refreshAfterManualLending

Issue#609 refresh after manual lending
Merge pull request #617 from henningmu/develop

Documented and Refactored Lending and Return view
Merge pull request #618 from Junkern/#603

#603
Merge remote-tracking branch 'upstream/develop' into javadoc

Conflicts:
	src/test/java/de/dhbw/humbuch/viewmodel/BaseTest.java