suggested improvements to parse-datetime's debug messages ('date --debug')

[Assaf Gordon]

Hello,

Attached are four small bug fixes and two additions to the debug messages in 
parse-datetime.y (used in 'date --debug').
The commit message for each commit gives a detail example of how/when it is 
used.
There are no changes to the parsing, only to the debug messages.

Comments and suggestions welcomed,

regards,
  -assaf

gnulib-parse-datetime-improvements-2017-01-01.patch.xz
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