New Product Definition Templates to generalize the percentiles (100-quantiles) forecast Templates to any q-quantiles about grib2 HOT 8 CLOSED

added a tentative commit for this branch, please check.

ON a side note I noticed that template 4.10 is still tagged "experimental" in the csv file. Anyone knows why?

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@sebvi could you provide sample data using this template and a decode output to complete the validation process? I understand that the use of products encoded using this new template will be limited to users of ecCodes at this moment and therefore there is no reason not to approve it because there is no other decoders available. Please comment if there is objection.

C.f. 7.3 Testing with relevant applications
For changes that have an impact on automated processing systems, the extent of the testing required before validation should be decided by the designated committee on a case-by-case basis, depending on the nature of the change. Changes involving a relatively high risk and/or impact on the systems should be tested by the use of at least two independently developed tool sets and two independent centres. In that case, results should be made available to the designated committee with a view to verifying the technical specifications.

ON a side note I noticed that template 4.10 is still tagged "experimental" in the csv file. Anyone knows why?

When GRIB2 was introduced, not all templates were validated because there were no users, and at a later stage, these templates were flagged as “experimental” (there is a note under each template saying “Preliminary note: This template was not validated at the time of publication and should be used with caution. Please report any use to the WMO Secretariat (Observing and Information Systems Department) to assist for validation.”) and this is indicated as "experimental" in the status column of computer-readable tables. PDT 4.10 is one of these templates.

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seems to work now

I have uploaded a sample file for each new template (zip). The bitmap and data section have been removed otherwise the files were too big
PDT86_ecmwf.zip
PDT87_ecmwf.zip

here is the dump in txt files using ecCodes
PDT86_ecmwf.txt
PDT87_ecmwf.txt

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@sebvi - The CSV needs some improvement and also, given the discussion today, should we keep the status as Experimental? It looks like you put this here, because the product is experimental.... 

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@amilan17 you are correct, I forgot the few empty columns at the end
I will update that.

Status: My understanding is that, using the current workflow (that we may drop soon), the status should change to operational once validated.

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@sebvi  thanks for the fix. That's not a practice that I want to support, so I'm going to change it to Operational now so I don't have to edit later and to minimize confusion when cleaning up the status columns.

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