maxValue is now a fixed value, not the max value from data set
Now when a value is change, all other values are changed to make so that the total remains the same
Fixing some bugs on values calculation; added configurable exponential scale
Now total of values is much more stable when changing values
Now total is virtually impossible to change
removed console debug messages
Added concentric grid
Values should never be greater than maxValue
Added axes labels
Added Data Labels
Fixed bug in data-label updating