shell files in packaging/win32 better with extensions

[Christian Stimming]

Hi Andi,

just today I got my new WinXP Laptop and I started to use the 
gnucash-on-windows build again. So far everything runs fine - with one 
exception: When initially downloading the content of packaging/win32, the 
fact that some files don't have an extension really confuses Windows. I ended 
up with "defaults.htm" instead of "defaults", and "functions" the same.

Could we go back to .sh as file extension? We don't need extensions anywhere 
else, but in this particular case I think they would be helpful. 
 svn move functions functions.sh
 svn move defaults defaults.sh
Thanks.

Christian