valuation: don't let future P directives influence default valuation/end date #2449
+115
−75
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This is a proposed fix for #2445.
Previously, for end-value reports, a P directive later than the latest transaction could set the default report end date and valuation date - even if that P directive was in the future.
Now, future-dated P directives are ignored; only non-future P directives can influence valuation date.
The PR also tries to clarify report span calculation, and various related functions.
The changes to tests show that the P directives can also extend the report end date, which seems to be new behaviour. I'm not sure if the old or new behaviour is more correct/intuitive/straightforward, so this needs some review and discussion.