Iso: Handle unusual 'parent' entry marked as file, rather than directory, reported by shamurshamur.
Iso: Handle unusual 'parent' entry marked as file, rather than directory, reported by shamurshamur.

The ISO9660 spec is not explicit that the special 'self' and 'parent' entries in directories should be marked as a directory, so make DiscUtils more lax about identifying these special records.

breezechen/DiscUtils,quamotion/discutils,breezechen/DiscUtils,drebrez/DiscUtils