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* src/tail.c (main): Add an undocumented ---disable-inotify option
to allow disabling inotify.
* tests/tail-2/pid: Run test in both normal and "disable_inotify" modes.
* tests/tail-2/tail-n0f: Likewise.
* tests/tail-2/wait: Likewise.
* tests/tail-2/append-only: Likewise.
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* tests/tail-2/pid: Use the timeout command to determine process
longevity, rather than querying /proc/$pid/status.
The latter was racy in any case when inotify is used, as then
tail wakes up periodically even for unchanging files therefore
causing the check for "S (sleeping)" state to fail intermittently.
* tests/tail-2/wait: Likewise.
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* tests/tail-2/pid: Speed up the test by specifying a
timeout of 100ms rather than the default 1s. Also
skip the test instead of failing in the unlikely case
were the pid required to be missing pid is present.
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* src/tail.c (tail_forever_inotify): The fractional
part of the delay was 1000 times too large.
* tests/tail-2/pid: Add a test to ensure the
timeout happens for this case.
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* tests/tail-2/pid: Ensure tail exits successfully when PID dies.
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* tests/tail-2/pid: Print unexpected $state upon failing.
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* NEWS: Document the new feature.
* m4/jm-macros.m4: Check if inotify is present.
* src/tail.c (tail_forever_inotify): New function.
(main): Use the inotify-based function, if possible.
* tests/Makefile.am: Add new tests for tail.
* tests/test-lib.sh (require_proc_pid_status_, get_process_status_):
New functions.
* tests/tail-2/pid: New file.
* tests/tail-2/wait: New file.
* tests/tail-2/tail-n0f: Refactor code into the test-lib.sh
require_proc_pid_status_ function.
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