irpeat 0.2.0

• Performance improvement for irp_preprocess().
• Updated irp_preprocess(), model preprocessing configurations, and prediction functions to consider the new arguments (1) new_x_type from ir::ir_bin(), and (2) bd_do_impute from ir::ir_bc().
• Update the documentation: Adding explicit warnings to irp_content_klh_hodgkins(), irp_content_kl_hodgkins_model, and irp_content_h_hodgkins_model that the related models are not reliable for peat.

Bug fixes

• Correct a typo which made it impossible to compute holocellulose_2 with irp_content().