pytsk/libtsk does not correctly/fully handle NTFS

[joachimmetz]

libtsk (and therefore pytsk) does not correctly handle NTFS. Issues reported to upstream:

• incorrect link count for NTFS short/long file name pairs https://github.com/sleuthkit/sleuthkit/issues/1881
• incorrect date and time conversion https://github.com/sleuthkit/sleuthkit/issues/2575