Generate null transactions for empty periods

For example, if one uses -M to generate a monthly report for an entire
year, and there are no transaction in the month of February, ordinarily
Ledger would report nothing for that month, even if -E were used.  Now
"null transactions" are generated for periods without any activity, in
order to make certain reports -- such as running monthly averages --
more accurate.

For example, instead of -MA being just a monthly running average of
months with activity, it is now a true average among all months during
the reported period.

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