PartitionedArrays v0.2 ‐ v0.3 caveats

WIP ...

• [WARNING PArrays v0.3] In a number of different scenarios, the user is required to pass partition(::PRange) as an argument to a function, e.g., PVector(...,partition(gids)). In many of these scenarios (if not all), there is no type annotation in the function header, so that one may pass gids instead of partition(gids) as an argument in the function call. This causes errors which are hard to relate with the cause of the problem itself, and one has to be quite sharp to understand the problem from the error message.