Massive changes...
Merge branch 'master' of https://github.com/Dexxon/warehouse.git
Minor change to parseDate
Fixed a bug in stockUtilizationInPeriod
Minor changes in generateTestData
Testdata is now properly written and read
Replace System.out println with System.err.println for Error-Messages
Changed the way MenuItems are added
Back and Quit are now both at the end of a Menu
Revert "Changed the way MenuItems are added Back and Quit are now both at the end of a Menu"

This reverts commit f27688e02c876a4d8785bda9c17379294cf7455a.
Removed uneccesary comments
getTransacionsInPeriod works now correctly
Reorganizing of method-order
Removed uneccesary methods
Bug-fixing in Menu
Bug fixing in Analysis
Removed debug-output
Improved Method inputArticleID
Removed debug-outputs