Bug#898202: mp3gain

[Gürkan Myczko <gurkan@phys.ethz.ch>]

mp3gain seesm to have been in the archive, and i would include the old 
historical mp3gain debian/changelog if possible:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=241751

meanwhile someone asked for something like that in #debian so here you 
go:

http://phd-sid.ethz.ch/debian/mp3gain/

(debian/copyright needs be done, and the manpage some fixes, generated 
with help2man)