Added include headers to mainWindow.cpp
Added more private variables to mainwindow to help with the infusion rate calculation.  Added to function prototypes to mainwindow.h that are used to calculate the infusion rate.
Changed progressValue to intervalSeconds to better keep track of time during a rating interval.
See previous commit.  Also defined the functions to calculate the infusion rate and calculateCoefficents.  The functions were debugged and should be mimicking the original program.
QtCreator file