Final quick wins about arc_kaggle HOT 7 OPEN

Adding some unsolved tasks that we could target:

• Easy reference implementation: 74,142,181,451,742
• pixelwise: 303,433,467,674
• symmetrize shapes:61,108,284,295,461,464,472,542,604,628,716
• Other easy tasks?: 29,168,276,278,329,333,368,414,443,453

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For tasks 303 and 467 there was a bug in getBestMultiplyMatrix. Now it's fixed (c82371d).

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Tasks 168 and 368 are already solved. Tasks 278 and 329 should be solved, but are not. I'll look into it.
The problem with task 443 is the way I define fullFrame. Right now, no pixels of the same color of the frame are allowed inside the frame in order to be considered a fullFrame. Relaxing a bit this definition should fix the issue.

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The problem with tasks 278 and 329 is that they were considered fixedShapes. I just deleted this extra check (ce8f797), which is not of much use in this particular case.

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Task 650 should be solved. Right now I don't know why it isn't.

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Adding the (I believe) unsolved tasks related to these specific functions:

• cropShape: 87,204,318,473,586,774
• replicateShape: 4,53,74,88,132,190,196,207,362,424,474,509,539,659,683,779,795
• arrangeShapes: 21,29,45,95,125,158,200,232,237,252,263,295,365,414,434,475,535,558,
  588,589,699,759,760

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I'm working on the following:

• a task attribute: self.twoShapeTask. For now it is a boolean vector
  [task has two shapes, multicolor, diagonal, shapes have same size]
  We can add more checks in the preprocessing.

• a function: getBestTwoShapeFunction. Given a task where self.twoShapeTask[0]==True,
  try many operations. The ops to try depends on the truth values of self.twoShapeTask.

Targeting tasks like: 453,70,158,169,244,274,674,760,484

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