(PDB-221) Add facts to import/export

This commit imports/exports facts similar to how we currently import/export
catalogs and reports. Anonymize doesn't currently work for facts, which is
going to be added separately.
Added support for exporting facts/reports when
no catalog has been persisted for the given node
Merge pull request #875 from senior/ticket/master/pdb-221

(PDB-221) Add facts to import/export