gis_visualization.lib.php renamed as tbl_gis_visualization.lib.php. PMA_getHtmlForGisVisualization, PMA_getHtmlForOptionsList methods added to the tbl_gis_visualization.lib.php
added methods PMA_getHtmlForColumn and PMA_getHtmlForUseOpenStreetMaps
Merge pull request #448 from scnakandala/gsoc_2013

refactoring tbl_gis_visualization.php