Add capability to select fields to dump (#819)

* 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).

* first implementation of Diags base classes

* add example, temporarily

* 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 more functions

* 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

* cleaning and initialize output mf

* use general average routine

* move flush in new class, and implemented the Plotfile derived class

* add comments

* eol

* free memory in destructor

* typo

* typo

* no need to clear MF pointers there

* though shalt not break existing tests

* FlushRaw doesnt have to be virtual for now

* The importance of being constant

* Capability to select fields in output files

* EOL

* revert to old inputs

* const in right place

* avoid brace initializer there

* oops, fix logic error in is_in

* pass by const ref, as suggested by Andrew's review

Co-authored-by: Edoardo Zoni <ezoni@lbl.gov>

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