prevtoinc 0.12

• add new functions calculate_CI_I_pp and CI_np_bs to calculate confidence intervals for the gren estimate of incidence per patient
• add new function create_patient_history_add to simulate a timeline of a bed
• add “naive” estimator based on empirical probability of A=1 to the set of estimators for calculate_I and generate_I_fast
• some smaller fixes and changes

prevtoinc 0.11

• initial CRAN-release

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