Log Message:
Update to 1.4.0

  exitnow.awk:
    - Fix: exitnow(status) finishes the execution of the script
      without running END sections even if status == 0.

  New module io.awk that includes the following functions:
  is_{file,dir,exec,socket,fifo,blockdev,chardev,symlink},
  file_size and file_type.

  tokenre.awk:
    - Function splitre0() was added that splits $0

  More regression tests were added.