- Changed C - style comments in map-mt32-to-gm.h to C++ - style comments
- Added a new dynamic MT-32 -> GM mapping, complementary to the normal one, which can be done on the fly using the new console command "map_instrument"
- The "show_instruments" command has been moved to the music section and now displays the instruments of the game which aren't in the MT32-> GM mapping
svn-id: r53902