baseAddr
ptrops
* return `nil` for empty openArrays / avoid returning `16` * move to `ptrops`, deprecate `ptr_arith` fully
* stylecheck: nnkArglist -> nnkArgList * --stylecheck:error iff >= 1.6.0
unittest2
* Migrate to `unittest2` why: Global symbol overflow when running NIM 1.2 on Github ci suggests that unit tests run sort of separately. The replacement library `unittest2` provides that. * Build ci dependencies