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
Merge pull request #117 from jarmokortetjarvi/backend-rohmu

Add order amount calculation multipliers