correctly print RNG nodes

See merge request !78

- bugfix: loop counter of vectorized loop now correctly stored as SIMD vector with entries i, i+1, i+2, ...
- basis for in-kernel boundary handling

Fix printing of sp.Infinity/sp.NegativeInfinity

See merge request !71

For sympy, oo s a number. So pystencils prints a type infinity a double
INFINITY as INFINITY.0

Fix error in README.md: pystencils[pyopencl] -> pystencils[opencl]

See merge request !70

Small fixes

See merge request !69

Declare LoopCounterSymbols nonnegative

See merge request !68

This removed some checks like `ctr1 <= 0` from my kernels

Set assumptions for TypedSymbol/cast_func/IntegerFunctionTwoArgsMixIn the SymPy way

See merge request !66

Bugfix: this bracket should not be here (collate_types returns single type)

See merge request !63

Bugfix: Align calculation of number of ghost layers on GPU with CPU version

See merge request !65

Bugfix fields accessed for interpolator access

See merge request !62

Bugfix avoid east and west const

See merge request !64

For the calculation of the number of ghostlayers only relative accesses
should be considered like on the CPU version

Pystencils will print two const when printing an assignment to a const numpy.dtype.
With the new type interference, this case can now occur more often

type)

Kernel wrapper

See merge request !61

Eliminate usages of old name 'equation collection' for `AssignmentCollection`

See merge request !60

Document backends.json

See merge request !59