Applied #15393 (dghart) fixing wxRichTextTable for percentage widths


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74647 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove never implemented wxDateTime::IsGregorianDate().

This method was declared and even documented but never actually implemented,
and GregorianAdoption enum used by it had many incorrectly defined elements.

Just remove both the method and the enum instead of fixing/implementing them
as they are not that important (as witnessed by the fact that nobody has
complained about the method being missing since almost 15 years).

Closes #15400.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74648 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Tamil translations update from Dinakar T.D.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74649 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775