ZynAddSubFX 2.2.1

News:
- made to work with mxml-2.2 (will NOT work on older versions)
- it is possible to remove completely the graphical user interface (e.g. it can run without
X). For this you need to modify the DISABLE_GUI option from the Makefile.inc
- added a commandline -L which load a instrument (.xiz) - now it only loads to part 0 (you
can use this option with -l to load a master file and after this the option -L to replace the part)