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  Name:     nexthandle() - find out the next available handle number
  Usage:    <integer> = nexthandle()
  Params:   none
  Returns:  integer equal to the next available handle or -1 if none

 ---------------------------------- Example ---------------------------------

                 ? nexthandle() && prints 5
                 handle = fopen("test.txt")
                 ? nexthandle() && prints 6
                 fclose(handle)
                 ? nexthandle() && prints 5