[AWFFULL] Patch for beta3 issues

[Steve McInerney]

All,

the attached patch fixes the two issues that have come out so far.
1. Being the floating point exception Oden found
2. Being the weirdness Eric (Woudenberg) reported.

Both were fundamentally due to poor assumptions on my part in setting values
that were either bad, or subject to later vagaries. :-(

Eric's was a truly fascinating case. And is probably why it's taken so long
for the situation to be brought to light.
In essence - the data in a sample log he sent through is badly timestamped.
The logs are nicely sorted - IF you include the TZ. But in the same log are
TWO different TZ's separated by about 3 hours - which doesn't work too well
with awffull as is - as the assumption is made that all data in the log is in
a single TZ.

So that caused part of the flip-flopping, the other was caused by the
assumption above, and the bad data - in that the "previous time" value would
get set irrespective of whether the previous time was actually good or bad.
  == FAIL.


So, subject to external pressures, I'll give this patch a few days, and if no
one else ... complains :-) I'll roll out as v3.9.1 final.
The only other changes since 3.9.1-b3 are all text or cosmetic.

As ever, the bzr aware among you can grab the latest from:
$ bzr lp:awffull

Cheers!
- Steve
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