Add FILESYSTEM_LOAD and RDB_RDFIZE

AIF v7.6.2 open source filters

  * Improved afs_filesystem_load: Add support for shared Windows
filesystems. Improved Unix/NFS filesystem connector (include/exclude
directories and file patterns and support for NFSv4). Available as
opensource on GitHub: http://www.github.com/Antidot/AIF-Filters/
  * New afs_rdf_rdfize : Database to RDF connector using DirectMapping
or RDBRML norms. Available as opensource on GitHub:
http://www.github.com/Antidot/AIF-Filters/