cdcanthro 0.3.0

• Added logarithmic form of the z-score calculation when |L| < 0.01, to match the CDC SAS implementation for weight and height. BMI_L never approaches 0.
• Fixed documentation formatting for DOIs in references.
• If input data has ages outside the reference range [24,240 months), the function warns about this and gives the N. These rows are kept in the output

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