HPCC-8850 enhance package validation to check for unmapped files

Package validation should list the files currently in queries in the
queryset that aren't mapped in the packagemap.  In production environments
this will allow operations to make sure all files are mapped by packages.

Also added --pmid to allow existing packagemaps to be revalidated, and
--queryid to allow validation to occur only against a given query in
the queryset.

Signed-off-by: Anthony Fishbeck <Anthony.Fishbeck@lexisnexis.com>