TODO
----

[DONE] * Unique identifier per command, for easier tracking
       * Exception handling
       * File permissions checking
[DONE] * Remove monitors for client when client disconnects
[DONE] * evfs_fs_sftp (SSH filesystem plugin)
[DONE] * bzip2
[DONE] * gzip support
       * ldap plugin
       * iso plugin

Metadata system
---------------
       * Query interface for harvested metadata


Vfolder system
--------------
       * Plugin system to attach vfolder plugins (i.e. trash can etc)

Plugins
-------
	SFTP
	----
	* Handle different open types.  E.g. if you don't have write and create permissions,
	  you can't dl the file, etc.  Need to build in an open mask to the open function.

       Tar
       ---
       * Support the extraction of files from a tar file.