More work on extended attributes (reference is still a mount on Mac)

[jief666]

• xattr to indicate a symlink is hidden.
• com.apple.decmpfs xattr is hidden for HFS+ compressed file.
• com.apple.ResourceFork xattr is hidden for HFS+ compressed file.

[jief666]

I've fix some tabs, like you wanted it :-)

[jief666]

To make some tests, you can use a small image I've done with few different files (Hard link, symlink, file with different times, file with 200 xattr, files with utf8 names, etc.). Here : https://github.com/jief666/darling-dmg/blob/jief_wip/ImgTest.dmg