Don't require timespec/timeval-double conversion tests to produce
correctly rounded results to handle x86 and other archs with wider
intermediate results.
Instead of selectively suspending logging by redirecting messages to
/dev/null, increase the default minimum log severity to FATAL. In the
debug mode, all messages are printed.
The current default NTP era split passed the Unix epoch (~50 years ago),
which means the epoch converted to an NTP timestamp and back ends up in
the next NTP era (year 2106).
Fix the test to take into account the era split.
Specify the maximum length of the path in the snprintf() format to avoid
a new gcc warning (-Wformat-truncation). If the path doesn't fit in the
buffer, indicate with the '>' symbol that it was truncated. The function
is used only for debug messages.
