For objects with multiple hard links, use hash table to map between
object tokens and pathnames during traversal to avoid linear scan over
all previous objects for each hard link seen
Use separate hash table for h5trav "table" interface to map between
object tokens and an index into the table of visited objects. This
facilitates quick lookups of objects when adding hard link name aliases
for h5repack processing
jhendersonHDF
4883ee1ad8