Matlab writeFileAnnotation

This PR was useful in attaching huge logs to datasets/projects during dogfish import. This was used as a client side log attachment, and includes an RFE to accommodate writing the annotation in chunks.

Test : 
fileAnnotation = writeFileAnnotation(session, local_file_path);
link = linkAnnotation(session, fileAnnotation, 'Image', image_id);

Note: Use a file which is atleast greater than 64mb.
This is failing for large files with 

```
.No method 'write' with matching signature found for class 'omero.api.RawFileStorePrxHelper'.

Error in writeFileAnnotation (line 100)
    rawFileStore.write(byteArray, (filestart1-1), length(byteArray));
```

Main problem is that `fread(fid,[filestart1, filestop1], 'uint8')` returns a mxn array instead of skipping the beginning.Might want to use the `skip` option of `fread` instead.