Extract contents of an archive to a directory.
     
    
    Usage
    cbr_unzip(zip_file, dir = ".", keep_zip_file = TRUE)
 
    
    Arguments
    - zip_file
- a - characterstring, corresponding the archive filename, or
an archive object.
 
- dir
- a - characterstring, corresponding the directory to extract
archive contents. By default, the current directory is used.
(see- getwd()).
 
- keep_zip_file
- logical. If TRUE, deletes the zip archive.