pass the wavelengths object, not the concat'ed wavelengths

[ajwheeler]

Fix bug where synth would error when using noncontiguous wavelengths and nonzero vsini at the same time.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	ef14df8...	main / ef14df8...
synthesis/M dwarf/100 Å of APOGEE w/ water	7.41 ± 0.0035 s	7.6 ± 0.03 s	0.975 ± 0.0039
synthesis/M dwarf/4000 Å - 8000 Å VALD solar	12.6 ± 0.056 s	12.7 ± 0.12 s	0.989 ± 0.01
synthesis/M dwarf/APOGEE DR17 w/o water	9.51 ± 0.04 s	9.58 ± 0.039 s	0.993 ± 0.0059
synthesis/M dwarf/one wavelength	0.31 ± 0.0011 s	0.334 ± 0.012 s	0.929 ± 0.034
synthesis/sun/100 Å of APOGEE w/ water	0.855 ± 0.0057 s	0.851 ± 0.0016 s	1.01 ± 0.007
synthesis/sun/4000 Å - 8000 Å VALD solar	5.6 ± 0.032 s	5.66 ± 0.051 s	0.99 ± 0.01
synthesis/sun/APOGEE DR17 w/o water	4.87 ± 0.024 s	4.94 ± 0.04 s	0.987 ± 0.0094
synthesis/sun/one wavelength	0.119 ± 0.00042 s	0.121 ± 0.0012 s	0.983 ± 0.01
time_to_load	2.75 ± 0.0073 s	2.79 ± 0.087 s	0.987 ± 0.031

Memory benchmarks

	main	ef14df8...	main / ef14df8...
synthesis/M dwarf/100 Å of APOGEE w/ water	1.73 M allocs: 3.21 GB	1.73 M allocs: 3.21 GB	1
synthesis/M dwarf/4000 Å - 8000 Å VALD solar	8.62 M allocs: 7.11 GB	8.62 M allocs: 7.11 GB	1
synthesis/M dwarf/APOGEE DR17 w/o water	5.6 M allocs: 5.11 GB	5.6 M allocs: 5.11 GB	1
synthesis/M dwarf/one wavelength	1.15 M allocs: 0.288 GB	1.15 M allocs: 0.288 GB	1
synthesis/sun/100 Å of APOGEE w/ water	1.17 M allocs: 0.226 GB	1.17 M allocs: 0.226 GB	1
synthesis/sun/4000 Å - 8000 Å VALD solar	8.48 M allocs: 2.81 GB	8.48 M allocs: 2.81 GB	1
synthesis/sun/APOGEE DR17 w/o water	5.29 M allocs: 2.12 GB	5.29 M allocs: 2.12 GB	1
synthesis/sun/one wavelength	0.782 M allocs: 0.107 GB	0.782 M allocs: 0.107 GB	1
time_to_load	0.159 k allocs: 11.2 kB	0.159 k allocs: 11.2 kB	1