Revision 3690

NKSP: Added support for RPN and NRPN event handlers:

* NKSP language: Added support for RPN event handler
  ("on rpn ... end on" in instrument scripts).

* NKSP language: Added support for NRPN event handler
  ("on nrpn ... end on" in instrument scripts).

* Added built-in read-only variables "$RPN_ADDRESS" and "$RPN_VALUE" which
  may be read from the new RPN/NRPN script handlers to get the (N)RPN
  parameter that had been changed and its new value.

* Added built-in const variables "$NI_CB_TYPE_RPN" and "$NI_CB_TYPE_NRPN"
  which are identifying the new (N)RPN handlers as such at script runtime.

* Bumped version (2.1.1.svn30).