PR 48: CDate and Calendar unittest

- comply with file naming convention
- comply with class and method naming convention
- basic tests for lib.calendar

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75614 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
PR 49 from Werner: I18N for calendar and CDate.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75615 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
PR 50: Py3 fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75616 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix print statements that use the file= arg to use the print_ function from wx.lib.six instead.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75617 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775