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Hi! Could you add atomic mass unit to this package: https://en.wikipedia.org/wiki/Dalton_(unit) ? Thanks!

Dear developers,
When trying to convert physics constants into atomic units, I get the wrong behaviour:

julia> using Unitful, UnitfulAtomic
julia> using PhysicsConstants.CODATA2018: m_u
julia> m_u
Atomic mass constant (m_u)
Value                         = 1.6605390666e-27 kg
Standard uncertainty          = 5.0e-37 kg
Relative standard uncertainty = 3.0e-10
Reference                     = CODATA 2018

julia> aunit(m_u)
mₑ

julia> uconvert(u"kg", 1.0 * aunit(m_u))
9.1093837015e-31 kg

Which is indeed wrong, as m_u should be 1.6605390666e-27 kg, as specified by physics constants. Is this a bug of UnitfulAtomic?

I tried this package on windows 10 with Julia 1.6.0 and it returns an error
julia> using UnitfulAtomic
julia> aunit(2.3u"cm")
LoadError: UndefVarError: @u_str not defined

Jan