Matlab shape helper functions

[sbesson]

This PR creates

• a series of helper functions to create common Shape objects,
• a generic setShapeCoordinates() function to set z, c, t,
• a series of unit tests for each new function.

[jburel]

@sbesson, @joshmoore : good news Matlab is ready. I should have it installed tomorrow. This also means that we should be able to have jobs running soon. I should know more tomorrow.

[jburel]

@sbesson: the model specified that z, c, t are non negative int. So it should fail.
Also are you planning to add a function for Line?

[sbesson]

@jburel: addressed most of your comments.

• added additional input checks in shape creating functions and implemented corresponding unit tests
• split unit tests into separate classes for each shape
• setShapeCoordinates() now allows to pass null to the shape. setShapeCoordinates(shape) sets all Z, C, T dimensions to null by default. Should we use 0 as the default? Or should we rather require, z, c, t to be specified in the input (incl. [])?

[jburel]

We do not use 0 as the default elsewhere. default should be null

[jburel]

Nothing specific to matlab code, we may want to avoid width, height, radius of 0.

[jburel]

Maybe it is already in the pipeline, it might be good to add more tests for shape with negative z, c, or t.

[sbesson]

@jburel:

• width, height & radii non-zero checks were already implemented. Added corresponding unit tests.
• added tests for negative Z, C, T as well as explicit setShapeCoordinates(shape, [], [], [])
• also added a mask size check size in createMask()

[jburel]

Ready to go unless you are planning to add more commits to that PR.

[sbesson]

No additional commit for this PR.