Add dicom read tools to third party toolbox. about gerardus HOT 5 CLOSED

Original files have been added. Still need to upload my own changes to this 
code. In addition conflicts between my changes and Tasos' changes to the 
original code need to be resolved - see issue 28

The update to this code has been delayed by a bug in my own code which I 
haven't had a chance to fix.

Ramon to meet with Chris and check whether we have the right copyright and 
licence header. 

After that, Ramon to meet with Ben and Chris to check whether Ben can use it or 
what changes it needs.

New function added with my modifications to:

matlab/FileFormatToolbox/load_multi_dcm_dir.m: (0.1.0)

- Modifications to original third party function 
matlab/ThirdPartyToolbox/loaddcmdir.m.

- Interface changed to give preview of image. 

- Allows the selection of multiple series. 

- Fewer output arguments, now the only output contains the
information of the series selected.