Also rename asyncly to aparallely and runAsyncT to runAParallelT
The name Async is confusing and does not convey the right meaning. The 'A' in
AParallelT stands for 'Adaptive' and 'Parallel' indicates that this is a
variant of Parallel.
Another choice for the name was 'MParallelT' where 'M' stands for 'maybe', it
is maybe parallel since it may or may not start parallel threads depending on
demand but Adaptive fits better as it adapts to the demand.