Revision 1750

* added support for chromatic / drumkit mode Roland GS Sysex message
  which is usally used to switch a part between chromatic sounds and
  drumkit sounds (as opposed to their common default setting of MIDI
  part 10 being a drumkit part and all other ones chromatic parts), in
  LS however one can switch between the first 16 MIDI instrument maps
  of all ones defined for the sampler
* bumped version to 0.5.1.6cvs