Fix the databaseloader class

The database loader class has been fixed so that all the labs/courses/students etc now contain proper valid data such that the queue works correctly upon starting up.

Closes #248 (closed)

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• bb899716 - Apply suggestion to src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java

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• aa9c12ff - Make one of the test labs with sign off intervals.

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mentioned in commit 96f2ae80

merged