It previously had to kludge a 1900-to-1999 date into a 1950-to-2049
range; it can now tell QDTP to do that for it. In particular, this
fixes a problem with 00-02-29, which failed to parse using 1900 as
base year so couldn't be corrected to 2000-02-29, which is now the
date it finds directly.
Task-number: QTBUG-46843
Change-Id: I7ac936bdfb15b78daed5d237c5d921c800af4951
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
9bf7d2a76a