censobr v0.4.0

Major changes
- Some functions (read_mortality, read_emigration) now include a new parameter merge_households (logical) to indicate whether the function should merge household variables to the output data. Partially closes #31
- {censobr} now imports the {duckplyr} package, which is used for merging household data. Closes issue #31.
- New vignette showing how to work with larger-than-memory data. Closes #42. The vignette still needs to be expanded with more examples, though.
Minor changes
- Updated Vignettes Closes issue #51
- Removed dependency on the {httr} package
- Now using curl::multi_download() to download files in parallel. This brings the advantage that the package now automatically detects whether the data/documentation file has been updated and should be downloaded again.
Changes to data sets and files included in this version:
- Population microdata for the year 2000 now include a few columns that were not included before. Closes #44
- Included additional columns and fixed minor errors in data dictionary of 2010 microdata. Closes #45
New data set and files included in this version:
- 1960 census Closes #32
  - Interview manual
  - Data dictionary for microdata of population and households
  - Microdata of population and households
- 1970: fixed geography columns. Closes #52
- 1991 census: Data dictionary for microdata of population and households. Closes #28

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