[io][lang] FilenameComparator

[Emmanuel Bourg]

Hi all, I have developped a File comparator to sort properly the files 
with a number in the name. For example, instead of sorting with the 
lexicographic order :

foo1.txt < foo10.txt < foo2.txt
it compares the numbers when the files share the same prefix and returns 
this order :

foo1.txt < foo2.txt < foo10.txt
This is how the "Sort by name" works in the Windows XP file explorer. 
Since it's quite low level I think it could be included in a commons 
project, but I'm not sure where:

- in [io] as a getComparator() method in FileUtils or as a 
FilenameComparator class ?

- in [lang] as a String comparator ?
- nowhere because this was already implemented in another well known 
project and I wasted my time reinventing the wheel ;)

Emmanuel Bourg
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