Python bindings: for Python 2.X, accept unicode string as argument of Feature.SetField(idx_or_name, value) (#4608)

git-svn-id: https://svn.osgeo.org/gdal/trunk@28259 f0d54148-0727-0410-94bb-9a71ac55c965
internal libtiff: resync with upstream CVS

git-svn-id: https://svn.osgeo.org/gdal/trunk@28260 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx