create stitch.rspec for row-wise merges

[thomased]

Wondering if merge.rspec() could be tweaked to allow for row- or column-wise merges (probably via a new argument, since by = specifies the column to be used for merging). I'm thinking of UV-VIS + NIR merges, where you've got separate measures of spectral regions separates but want to row-merge them into one full range spec. Would need to think about how to handle spectral gaps etc., but shouldn't be too tough.

[Bisaloo]

I think it would be better to use another function since it would differ a lot from merge.data.frame, which is the function most users will be familiar with.

I was thinking of using rbind.rspec but it's not ideal either since it may discard rows in case of wavelength range overlap. Maybe the most reasonable option is a completely new function such as stitch.rspec.

[thomased]

Yeah fair enough. merge and stitch — I could see something like that working.

[Bisaloo]

combine could be another option.

[Azem1hyseni]

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