Tags can now be selected for inheritance by using a list or a regular
expression.
Also for property inheritance, we now allow a regular
expression (list selection existed before).
The property API can now retrieve the value of a property
with inheritance based on the value of
`org-use-property-inheritance'. Earlier this value was ignored
when querying an entry. It still is ignored by default, but by
passing `selective' as the INHERIT flag, it can now be used.
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