statistics-bootstrap-v3.5.0

• changes to ibootnhst include renaming old name-value pairs 'clusters' and 'strata' to 'nested' and 'block' respectively to reflect the conventional terms used in ANOVA - old names are still recognised for backwards compatibility. The block argument makes the bootstrap semi-parametric since it now automatically centres the data of each block prior to stratified resampling. These changes make it easier to analyse data with randomized block designs and repeated measures designs.