- Implement warnings and errors for certain inputs concerning averaging periods

- added first documentation on time averaged diags
- put more operations on summation multifabs into if-environments

- added time averaged diags to laser-ion acceleration example
- fix first issues that came up when testing this

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Currently, we do not yet support the newly implemented adaptive time-stepping
mode of electrostatic solvers together with time-averaged diagnostics.

Even though the laser ion test is named as a dependency it is running this
test again. That should ideally be avoided. It would be good to just run
the analysis script as test.

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For PICMI, the TimeAveragedDiag test is automatically disabled because we
cannot simply define the necessary output intervals.
We need to be able to define period=[100,69:100] like for the app input.

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Modify checksum evaluation call to follow example from PR ECP-WarpX#5297.

Co-authored-by: Edoardo Zoni <[email protected]>

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…fields`

Co-authored-by: Edoardo Zoni <[email protected]>

Co-authored-by: Edoardo Zoni <[email protected]>

Updating the relative tolerance to 1e-12 to keep it strict because the test compares two diagnostics that come from the same run on the same machine, just that one averaging happens in-situ while the other is done in post-processing.

Co-authored-by: Edoardo Zoni <[email protected]>