Assignment to slices, part 1
Fix a logical typo
Assignment to slices, part 2
Add a comment about some slicing assignment methods
Assignment to slices, part 3
Fix two small typo bugs
Even more slicing assignment functions

Now we have the full grid of possibilities implemented: For 'M', 'N'
two instances of a domain satisfying 'TwoDimensionalArrayCategory' we
can write the following assignment to a subset of 'M'

  M(u, v) := N

where both selectors u and v can be any of:

- A single Integer
- An Integer Segment
- List of Integers
- A List of Integer Segemnts