
Make damage curve
make_curve.Rd`make_curve()` makes the damage curve, for a crop. This function is called in `calculate_damaging()`.
Arguments
- damaging.core
- data.frame, damage function for each type of phenomena impacting a crop. See `inst/extdata/default/damagement/<crop>/damaging.core.csv`. 
- damaging.complement
- data.frame, complementary damaging information for a crop. See `inst/extdata/default/damagement/<crop>/damaging.complement.csv`. 
- calendar
- data.frame, crop calendar. 
- level
- list giving levels for hazard parameters (current, duration, height, week), default to floodam.agri::LEVEL. 
- combine
- list of combine methods for each type of phenomena used to group damaging function. 
- current
- data.frame, correspondance between velocity qualitative classes and their numeric value. Default to floodam.agri::CURRENT. 
- type
- character, should output be of class data.frame or a list, default to "data.frame".