switched directory listing call to use jargon paging API

Using the non-paging API would result in out of memory errors when
loading the contents of large directories.
Switched to using system property to specify the instance Id

The instance Id should be specified as the system property
infosquito.id provided as a JVM option.
fixed bug in visit-entries

If a bad path was found, it would still visit the entry.  This would
cause an exception to leak out of index members.

The unit tests were updated to support the new paging in boxy.
added unit test to check that reading pages of collections works.
extended test of index-members paging test to verify entries indexed