Put x axis values first in CSV

[axelboc]

@Blackclaws in #1619 (comment) correctly pointed out that axis values are expected to come first in CSV exports, like in XY and XYE files. Sorry for missing this in #1763.

NeXus export with axis values

NeXus export without axis values

The indices are used so that signal values remain in the second column; the column is labelled x:

Basic 1D export

No axis values, no column headers — does that make sense @t20100 @loichuder?

[loichuder]

I would perhaps add the dataset name as the column header for the basic 1D export?

[loichuder]

Suggested change

	csv += isNexus
	? `${(abscissaParams.value ? abscissaParams.value[i] : i).toString()},`
	: '';
	if(isNexus) {
	csv += `${(abscissaParams.value ? abscissaParams.value[i] : i).toString()},`
	}

[axelboc]

I would perhaps add the dataset name as the column header for the basic 1D export?

Okay, so in that case, I can have the indices in the first column to basically end up with a "bare minimal" NeXus export (i.e. NXdata group with only a signal attribute):

[loichuder]

I would perhaps add the dataset name as the column header for the basic 1D export?

Okay, so in that case, I can have the indices in the first column to basically end up with a "bare minimal" NeXus export (i.e. NXdata group with only a signal attribute):

That looks excellent! Good call 👍

[loichuder]

Me approves again