Revision 3587

NKSP: Real number support for core instrument built-in functions.

* NKSP: Built-in function "play_note()" accepts now real numbers and
  seconds as unit type as well for its 3rd and 4th function arguments.

* NKSP: The following built-in functions accept now real numbers as well for
  their 2nd function argument: "change_vol()", "change_tune()",
  "change_cutoff()", "change_attack()", "change_decay()",
  "change_release()", "change_sustain()", "change_cutoff_attack()",
  "change_cutoff_decay()", "change_cutoff_sustain()",
  "change_cutoff_release()", "change_amp_lfo_freq()",
  "change_cutoff_lfo_freq()", "change_pitch_lfo_freq()",
  "change_vol_time()", "change_tune_time()", "change_pan_time()",
  "fade_in()", "fade_out()", "change_play_pos()".

* NKSP: Fixed built-in function "change_play_pos()" not having accepted
  metric prefixes at all.

* Bumped version (2.1.1.svn12).