Simple API prototype: delete

[jamoore]

As opposed to the method defined by #2667 (story: #2665), a "simple" API for delete would look like:

 class Delete extends Action {
   string t;
   long id;
   StringMap options; // e.g. {"/Image/Tag": "ORPHAN"}
 };

 Report submit(ActionList actions); // No OMERO exceptions
 Future async(ActionList actions); // No OMERO exceptions

Here, "simple" means:

• No exceptions are thrown other than Ice infrastructure exceptions (ConnectionLost, etc.)
• As many actions can be batched into a single transaction as desired
• No dependences on omero/API.ice or other methods (smaller executable overhead)
• Self-contained *.ice file which explains all possibilities, i.e. all error codes.

[jmoore]

Done as a part of chgrp:

commit 4e5fc03f999d956c2f0c76fb7f068007e830a4cc
Author: jmoore <josh@glencoesoftware.com>
Date:   Mon Jul 25 15:11:24 2011 +0200

    Initial Commands API with chgrp example (See #3845)