Use new flags feature to allow us to test format dates outside the two digit
year parse range.
Add dates to test for sf.net bug #1357272 and a couple of related issues.
(eg,6Feb{1856,1857,1937}) .
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37323 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775