stackr: new functions

v.0.2.7

• Added a NEWS.md file to track changes to the package.
• New function: individuals2strata. Several functions in stackr and assigner requires a strata argument, i.e. a data frame with the individuals and associated groupings. You can do it manually, however, if your individuals have a consistent naming scheme (e.g. SPECIES-POPULATION-MATURITY-YEAR-ID = CHI-QUE-ADU-2014-020), use this function to rapidly create a strata file.
• New function: tidy_genomic_data. Transform common genomic dataset format in a tidy data frame. Used internally in stackr and assigner and might be of interest for users.
• New function: read_long_tidy_wide. Read genomic data frames in long/tidy and wide format. Used internally in stackr and assigner and might be of interest for users.
• New function: stackr_imputations_module. Map-independent imputation of missing genotype using Random Forest or the most frequent category. Impute genotypes or alleles. Used internally in stackr and assigner and might be of interest for users.
• New function: find_duplicate_id Compute pairwise genome similarity to highligh potential duplicate individuals.