Using models from dotnet

There is a possibility to interface models from dotnet. It is not required as of now, maybe in the future if the need arises.

```apl
:Namespace dotnetmodels
⍝ Archive for dotnet models of apl primitives which may be
⍝ used in the future
⎕using←''
add←System.Decimal.Add
divide←System.Decimal.Divide
floor←System.Math.Floor
magnitude←System.Math.Abs
cmplxmagnitude←{sqrt add (pow (9∘○⍵) 2) (pow (11∘○⍵) 2) }
pow←System.Math.Pow
residue←System.Decimal.Remainder
sqrt←System.Math.Sqrt
:EndNamespace
```