r.what: Update to handle more than 400 bands

[YannChemin]

AVIRIS-NG has 425 bands, i.spectral is using r.what in the background has fails for hyperspectral imagery having bands more than 400.

[echoix]

Is there a specific reason why the number of files has a hardcoded limit? Is it something that should be documented?

[YannChemin]

Is there a specific reason why the number of files has a hardcoded limit? Is it something that should be documented?

I do not know, 400 images was really a lot in the old times

[echoix]

Is there a specific reason why the number of files has a hardcoded limit? Is it something that should be documented?

I do not know, 400 images was really a lot in the old times

Now you showed a valid, real-world use case for more than 400 files!

[nilason]

Should probably be backported to 8.4.

[ninsbl]

Cool! There are several other use cases where overcoming that limitation is very useful. Just one question: Did you consider using ulimit instead of hardcoding another, higher fixed limit? r.series does something like that...
It could be handed down to other modules that use r.what (e.g. t.rast.what). In an case, documentation should be updated too, I would say...

[neteler]

How about 1024 (I think a few hyperspectral cameras offering that).

[neteler]

The "TODO Fix 400 maps limit" needs to be removed from the HTML manual page file.