|-in VMBDG_EXEC flag on "--dbgall"
All instructions are now dispatched.

Example.  If you add an instruction:

  I_BLAH :codeblock B_cb int B_n

You must provide an implementation (in vm.c):

  int BLAH_exec(VM *vm, CODE_BLOCK *B_cb, int B_n, int *jumped)
  {
     if (vm->ip is changed) {
       *jumped = 1;
     }
     B_cb and B_n are operands from instruction definition;
     return error code or VM_OK;
  }