thanks to ntfsd and some google searches I worked out what the unknown

thanks to ntfsd and some google searches I worked out what the unknown
fields in level 261 and level 262 of directory search are, plus the
names of the levels

the unknown fields are a 64bit unique file id, and match the 64 bit
number from the internal_information qfileinfo level
(This used to be commit b69f54eb028a24144a2e813f059b08644118ab09)