Add more test for directory entries

[pmqs]

• Check for trailing "/" when External Attributes has directory flag(s) set.
• Check if directory bit(s) set in External Attributes when training "/" is present.
• Check that directory entry does not have uncompressed payload (APPNOTE 6.3.10, sec 4.3.8)
• Check if compressed payload present & uncompresses to zero bytes.
• Check that Extract Version is set to 2.0 or greater (APPNOTE 6.3.10, sec 4.4.3.2)

Notes for behaviour of unzip executables when dealing with directories without the trailing "/"

• On Linux Info-ZIP 6.0 will extract it to an empty file
• On Linux 7z & bsdtar (aka libarchive) extract it as a directory if the Unix bit is set, but not if the only the dos flag is set

[pmqs]

Done