Awk script: save printing "// <instruction> : no operands" until others have printed.
PT_APPLICATION in graphviz output should be "record" not "rectangle".
Fixed bug in for loop for writing out INSTR_struct.h
Compilation of "quick closures" and "quick params" implemented.

- Also added new debugging flag --dbgexec to enable execution of
  compiled code.  Use this when s_code instructions have no implementation.