* implement broadcasting array binary ops with device scalars

* test broadcasting array binary ops with device scalars

* re-add some asserts (better to be safe)

* be explicit in error msg

op -> operator

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* array binops: include asserts on out.shape as well

* set default args more elegantly

* Array shape checks: save shapes in temporaries

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* cl.array.ravel: take order as an argument

* adds test ravel

* Enable flake8-bugbear

* Remove two more attempts to iterate/cast options

- raise exception if array cannot be cast to result type
- enable inplace division of integer types