The merge-based functions were moved to `toolbox` to reduce unnecessary
cross-module dependencies (especially among core modules).  `equal_computations`
was moved from `scan_module` because it provides a basic graph object `__eq__`
implementation and it has multiple references outside of its own
module/sub-package.

Combining checks into one and dealing with skipped runs

* Update README

* Remove unused/unnecessary build and project files

* Update the issues template

* Add a pull request template
Co-authored-by: Brandon T. Willard <brandonwillard@users.noreply.github.com>
Co-authored-by: Thomas Wiecki <thomas.wiecki@gmail.com>

Stop importing test suite from __init__

- The 6-year old comment indicated that the import was done because of some GPU
  configuration, without providing any details
- The import actually imported the first thing called "tests" that is found in
  the PATH

Add JAX conversions for theano.tensor.extra_ops

`np.empty` was producing values at the edge of numerical zero.  These values
would apparently cause `jax` to truncate something during and intermediate step
of a comparison operation like `array > 0`, which would produce a result
different from standard NumPy's.