optics

Let tofu-optics users do this:

import tofu.optics.syntax.tupleN._

val lense = Tuple3._2[Int, String, Long]   // : Contains[(Int, String, Long), String]

tupleN object should contain all possible implicit extensions to Tuple{N} companion objects. Implementations should be macro generated.

The library needs tests to prevent bugs. This library uses pytest as test suite, which is by far the most user friendly test-suite for Python. This is great, because this means anyone can add tests; it's super easy! Moreover, it makes you acquainted with the code, which is why it's labeled a good first issue.

When adding tests, keep the following in mind:

Describe the bug
If eps_r is shape (N,) then the fields solved are shape (N,1)

Either:

• disallow 1-D eps_r arrays
  Or:
• keep track of eps_r shape and reshape the fields to match.

The new interface for interferograms requires the user to explicitly pass the mask, and provides the x,y,r,t variables in class with the positional state. This makes it significantly easier to use offset masks. The geometry module includes shifted versions of most shapes, but it may be worthwhile to add a interf.shift((dx,dy)) or interf.shift(dx, dy=None) method to move the grid.

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