mitab cleanup: explicit initialization of all all fields in gasBoundsList and add TAB_GEOM_MAX_TYPE to TABGeomType. (#5414)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27757 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx