this to your children or students)

PointerType should be rendered differently in OpenCL backend

Allow functions for Field.coordinate_transform

See merge request pycodegen/pystencils!118

Fix AssignmentCollection.{free_symbols,bound_symbols,defined_symbols} for non-Assignments

See merge request pycodegen/pystencils!114

   Add a star to correctly get atoms of InterpolatorAccess   

See merge request pycodegen/pystencils!115

FiniteDifferenceStaggeredStencilDerivation must be applied to field access

See merge request pycodegen/pystencils!109

Update AssignmentCollection.__repr__

See merge request pycodegen/pystencils!110

`Assignment Collection for y[0,0,0]` is usually not very helpful.

New representation:

```
In [6]:     forward_assignments = pystencils.AssignmentCollection({
   ...:         z[0, 0]: x[0, 0] * sympy.log(x[0, 0] * y[0, 0]),
   ...:     y[0,0] : x[1,1] +1
   ...:             })

In [7]: forward_assignments
Out[7]: AssignmentCollection: z_C, y_C <- f(x_C, x_NE)
```

otherwise the index gets lost

AssignmentCollection.__bool__

See merge request pycodegen/pystencils!108

Allow `CUSTOM_FIELD`s to have a different size in transformations.py

See merge request pycodegen/pystencils!107

This yields better error messages

AssignmentCollection can be used in many cases where you could also use
a List[Assignment]. With AssignmentCollection.__bool__, an empty
AssignmentCollection is falsy and a non-empty one truthy.

So you can `assert assignments, 'must not be emtpy'`

Fix FiniteDifferenceStaggeredStencilDerivation on Sympy 1.1

See merge request pycodegen/pystencils!105

Field.Access compare fails when one field access returns the offsets as ints in its hashable contents
and another one as sp.Integers.

Minor improvements to FiniteDifferenceStaggeredStencilDerivation

See merge request pycodegen/pystencils!104

Fix OpenCL for CUDA OpenCL by avoid int(...) constructor

See merge request pycodegen/pystencils!102

Fix printing for Functions without name

See merge request pycodegen/pystencils!103