Add -l list option to only list filenames

[stain]

The sunzip -l option is equivalent to -t -q -q, but instead of testing decompression will only print the file and directory names as they are encountered in the stream.

Note that file names from the local file headers are less reliable than the end-of-file TOC that would otherwise be used, and may include duplicates, deleted and encrypted files.

Output is silent so that STDOUT can be used with grep etc. Filenames are expressed as they will be written for the local OS (discuss!)

Here is example usage on a 1.9 GB zip file:

curl -sS -L 'https://zenodo.org/record/2838898/files/rnaseqwf_0.5.0_mac.zip?download=1' |  sunzip -l