mzinspectr 0.4.0

Changed name of package to "mzinspectr".
Updated ms_filter_alignment so it filters matches when removing columns from the peak table.
Added titles to mass spectra plots with peak name and retention index or time.
Fixed bug in retention index matching algorithm for ms_search_spectra function.
Added fixed_levels argument to ms_reshape_peaktable so features can be plotted in the order they're provided by the user.
Changed the name of the mzinspectr alignment object from msdial_alignment to ms_alignment.

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