zip-reader: Read the whole central directory at .zip open time.
[pspp] / tests / language /
drwxr-xr-x   ..
-rw-r--r-- 2713 command.at
drwxr-xr-x - control
drwxr-xr-x - data-io
drwxr-xr-x - dictionary
drwxr-xr-x - expressions
drwxr-xr-x - lexer
-rw-r--r-- 6237 mann-whitney.txt
drwxr-xr-x - stats
drwxr-xr-x - utilities
drwxr-xr-x - xforms