Hi all,

A few questions about OpenJUMP IO

1)
- Most of time, if I save a dataset as a shapefile, openjump will append 
.shp extension if I forget to include it in file name.
- sometime, it will refuse to save and will ask to add the extension. 
Yesterday, I noticed the same thing happens on a driver I wrote axecpt 
this time, the plugin through an exception if I forget the extension.

In jump.io.ShapefileWriter, I can see why I'm asked to add the 
extension, but I can't find where OJ add the extension by itself (what 
it does most of time).
If someone has a good knowledge of this part of the code, I would be 
interested to know what part of the code are involved in those different 
behaviours.

2)
- I found that LoadSaveDatasetFileMixin is not used in the code.
It comes from Jonathan Aquino who wrote an interesting article about 
mixins 
(http://jonaquino.blogspot.com/2005/07/java-mixin-pattern-or-faking-multiple.html),
 
but if the class is not used at all, i propose it is removed in a future 
version.

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