more informative error for flywire_xyz2id when coordinate space might be wrong

[alexanderbates]

This works:

# get ID
flywire.xyz = "108847.975,62454.2775,3811"
flywire.id = fafbseg::flywire_xyz2id(nat::xyzmatrix(flywire.xyz), rawcoords = TRUE)

However, earlier today I forgot that the default was not rawcoords = TRUE. If I do it with FALSE, I get this error:

flywire.xyz = "108847.975,62454.2775,3811"
flywire.id = fafbseg::flywire_xyz2id(nat::xyzmatrix(flywire.xyz), rawcoords = FALSE)
> Error in parse_url(url) : length(url) == 1 is not TRUE

And didn't immediately realise what was wrong. I also happened to get two separate inquiries over the last few days about why this function was not working, both times it was the same issue.

More informative error message needed?

[alexanderbates]

@tatsuookubo this was the issue we had earlier

[jefferis]

closed by #82