enhancement: add option to set the encoding clause in xml

Hello,
 
I'm French and use cvs2cl on my repository. My preferred format is XML.
Unfortumatly, French langague uses character > 128. Also, xml file
created by cvs2cl can't be displayed correctly.
 
I have made a modification to specify the langage in xml header
<?xml version="1.0" encoding="latin1"?>
Now, cvs2cl accepts the -e (or --encoding) command parameter following
by the langage specification.
cvs2cl -e latin1 --xml ...
 
I send to you a diff between my modif and the last version (2.39) and
also the full cvs2cl.pl
 
If you accept my modification, could you commit my modif
 
Best regards,
Patrick
(sorry for my poor english ;-), maybe your read French ? )