Need a new class that takes care of updating old version of file-types.

This is a completely new feature.

Describe the new feature should be added and what the current situation is.
Currently there is no mechanism for updating file-types between versions of 
Ingatan, but each file type does have a version identifier. There has not been 
a change in file type since the version identifier was added, and so no 
mechanism has been needed.

How will this feature improve the usability of Ingatan?
This will provide seamless upgrade between file types for each new release of 
Ingatan.

Do you have any suggestions for code implementation?
It is suggested that the mechanism for updating file-types be its own class, as 
its methods will rapidly grow in size as file-types are changed in new versions 
of Ingatan. The class should be used to check all Ingatan files each time 
Ingatan is loaded (if not too expensive) as well as whenever any library is 
imported.

Original issue reported on code.google.com by tom.eve...@gmail.com on 19 Nov 2010 at 11:29

edesiocs / ingatan

Need a new class that takes care of updating old version of file-types. #35