ogr2ogr: fix spelling error

From: Juergen E. Fischer <jef@norbit.de>

git-svn-id: https://svn.osgeo.org/gdal/trunk@26704 f0d54148-0727-0410-94bb-9a71ac55c965
gml: join multilinestrings to linestrings in rings

From: Juergen E. Fischer <jef@norbit.de>

git-svn-id: https://svn.osgeo.org/gdal/trunk@26705 f0d54148-0727-0410-94bb-9a71ac55c965
NAS: warn when geometry cannot be saved

From: Juergen E. Fischer <jef@norbit.de>

git-svn-id: https://svn.osgeo.org/gdal/trunk@26706 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx