Enhance MODE to bound check interest_function corner points in the range 0 to 1

[j-opatz]

Describe the Problem

It was recently discovered that the corner points as defined for use in the interest_function of MODE are boundless. Currently,

 centroid_dist = (
      (            0.0, 1000000 )
      (  60.0/grid_res, 1000000 )
      ( 600.0/grid_res, 0.0 )
   );

would return actual (albeit extremely high) interest values. Similar behavior is found with negative values.

The MODE documentation also states that interest function entries can be defined as algebraic expressions. Looking deeper into the code shows that this is not possible, and MODE will only accept interest function entries defined as piecewise.

Expected Behavior

The expected behavior would be that MODE errors out if a user provides interest function entries whose corners are not bound between 0 and 1. Additionally, there should be no mention of algebraic expression settings for the interest function entries.

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