[ptx] Hugin cleaning and reorganization

[Yili Zhao]

JD wrote:
> I think it doesn't.  I had volunteered to look into this, but never
> really got fully comfortable with the Vigra underpinnings and layout of
> the Hugin source.  
> Pablo indicated he was going to clean up and reorganize the source after 
> a release, so I was waiting for that to look further.

  I agree with that. 
  Pablo, maybe after releasing hugin 0.5, it needs to do some clean and reorganize work 
before developing a new version. Thus, we have a clean and clear hugin structure and 
can attract more developers.

Sincerely
Yili Zhao