Averages to cell centers (#795)

* Start implementation of new averaging with staggering:

- face-to-cell-center and edge-to-cell-center replaced so far;
- TODO: node-to-cell-center and 1D behavior (AMREX_SPACEDIM=1).

* Continue implementation of new averaging with staggering:

- new function takes reference to single MultiFab (no vector);
- TODO: node-to-cell-center still in progress.

* Fix small bug and clean up

* Fix bug in loop over n=0,...,ncomp-1 and clean up

* Add Doxygen documentation and clean up

* Small clean-up in Doxygen documentation

* Compile in single precision: add _rt suffix to avoid unnecessary conversions

* Avoid accessing staggering index directly from IntVect in innermost loops

* Replace do-while loop with for loop (default ncomp=1)

* Remove temporary pointer and pass reference to MultiFab (instead of MultiFab*)

* Replace AMREX_LAUNCH_HOST_DEVICE_LAMBDA with ParallelFor

* Merge code refactoring suggested in PR #809

* Fix bug after fixing merge conflicts

* Restore Doxygen documentation after code refactoring

* Unify implementation for 2D and 3D when possible

* Fix bug in 2D (IntVect type is not dimension-agnostic)

* Use ParallelFor in 4D and remove intermediate overload

* Remove temporary Vector srcmf and avoid unnecessary copies

* Simplify function AverageAndPackVectorField

* Delete function PackPlotDataPtrs (not used anymore)

* Minor revisions

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