Accumulator implementation bribes
Merge master 054683e89a0e7ecdc78ad36c47ce6f797c7e5ca6
Add nbWorkers/workerId support from ocr's hclib branch to accommodate lazy accumulator implementation
Add accumed_t clause to register accumulators with a forasync finish scope
Make clang happy with explict cast to non-volatile
Add NO_xxx for NULL async's clauses
Adding some more macros to define null values and improve hclib calls readability
Forasync stride support #13 and lazy accumulator implementation embryo API