[Gdal-dev] BMP not reading overview

[Peng Gao]

BMP format doesn't recognize an overview (.ovr) once one is built
for it.
It seems that the following is missing from BMPDataset::Open().

Gao, Peng

/* --------------------------------------------------------------------
*/
/*      Check for external overviews.
*/
/* --------------------------------------------------------------------
*/
    poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );