Log Message:
Update to 1.6.0

  Environment variable RUNAWK_KEEPTMP was introduced. If it set,
  temporary files are kept.  This is useful for debugging.

  io.awk:file_size was fixed (its behaviour depended on FS value)

  AWK_PROGS used for testing is now settable from environment.

  A few typos in runawk_modules.3 were fixed.
  Thanks to Andrew Shadura!