Merge pull request #95 from jarmokortetjarvi/backend

Backend
Move function to an individual file
Move a function to an individual file
Add OrderValueMultiplier function
Add a time constriction
Add interval functionality
Add sum functionality
Add multiplier calculation
Add minimum and maximum factors
Add facility expenses
Add salary expenses
Add others multiplier
Modify the minimum multiplier
Add order value multipliers
Add an attribute for a method
Fix the date truncation
Remove duplicate realized values
Fix active link color
Fix the query grouping
Add logged in name
Add a student menu
Modify student menu