The `ArrayCopy` method has been changed to be precompiled. It handles
most standard array types. But there are some special `ArrayHandle`
types that are not correctly handled, and these go to a slow fallback.
Find places in the code that use that fallback and fix them.
There are also some instances of replacing an `ArrayHandleCounting` with
an `ArrayHandleIndex`. This change is probably not strictly necessary to
make the `ArrayCopy` faster, but when it can be used `ArrayHandleIndex`
is generally better.
We have been doing a better job at hiding device code (and moving code
into libraries). Smoke out source that no longer needs to be compiled by
device compilers.
With recent changes to `ArrayHandle`, the type for the associated array
portal is now the same across all devices. This means that almost all
exec objects no longer need to be specialized on the device types. Thus,
clean up the locator exec objects to no longer need to be templated on
device.
The new name reflects better what the underlying algorithm does. It also
helps prevent confusion about what types of data the locator is good
for. The old name suggested it only worked for structured grids, which
is not the case.
