EDIT

 *  - migrating variables for map settings

    /*

     *  migrating variables for map settings

     */

    $cdm_map_distribution = array();

    $cdm_map_distribution['width'] = variable_get('cdm_dataportal_geoservice_display_width', 390);

    $cdm_map_distribution['height'] = $cdm_map_distribution['width'] / 2;

    _remove_variable('cdm_dataportal_geoservice_display_width');

    $cdm_map_distribution['bbox'] = variable_get('cdm_dataportal_geoservice_bounding_box', '-180,-90,180,90');

    _remove_variable('cdm_dataportal_geoservice_bounding_box');

    $cdm_map_distribution['show_labels'] = variable_get('cdm_dataportal_geoservice_labels_on', FALSE);

    _remove_variable('cdm_dataportal_geoservice_labels_on');

    $cdm_map_distribution['caption'] = variable_get('cdm_dataportal_geoservice_map_caption', '');

    _remove_variable('cdm_dataportal_geoservice_map_caption');

    $cdm_map_distribution['distribution_opacity'] = variable_get('cdm_dataportal_geoservice_distributionOpacity', '0.5');

    _remove_variable('cdm_dataportal_geoservice_distributionOpacity');

    $cdm_map_distribution['mapType'] = variable_get('cdm_dataportal_map_openlayers', 1);

    _remove_variable('cdm_dataportal_map_openlayers');

    // imageMap

    $cdm_map_distribution['image_map'] = array();

    $cdm_map_distribution['image_map']['base_layer']= variable_get('map_base_layer', 'cyprusdivs');

    _remove_variable('map_base_layer');

    $cdm_map_distribution['image_map']['bg_color'] = variable_get('map_bg_color', '1874CD');

    _remove_variable('map_bg_color');

    $cdm_map_distribution['image_map']['layer_style'] = variable_get('map_base_layer_style', 'ffffff,606060,,');

    _remove_variable('map_base_layer_style');

    // OpenLayers

    $cdm_map_distribution['openlayers'] = array();

    $cdm_map_distribution['openlayers']['base_layers'] = variable_get('baselayers', array('osgeo_vmap0' => 'osgeo_vmap0', 'PREFERRED' => 'osgeo_vmap0'));

    _remove_variable('baselayers');

    $cdm_map_distribution['openlayers']['show_layer_switcher'] = variable_get('cdm_dataportal_geoservice_showLayerSwitcher', TRUE);

    _remove_variable('cdm_dataportal_geoservice_showLayerSwitcher');

    $cdm_map_distribution['legend'] = array();

    $cdm_map_distribution['legend']['show'] = variable_get('cdm_dataportal_geoservice_legend_on', TRUE);

    _remove_variable('cdm_dataportal_geoservice_legend_on');

    $cdm_map_distribution['legend']['opacity'] = variable_get('cdm_dataportal_geoservice_legendOpacity', '0.5');

    _remove_variable('cdm_dataportal_geoservice_legendOpacity');

    $cdm_map_distribution['legend']['font_size'] = variable_get('cdm_dataportal_geoservice_legend_font_size', 10);

    _remove_variable('cdm_dataportal_geoservice_legend_font_size');

    $cdm_map_distribution['legend']['font_style'] = variable_get('cdm_dataportal_geoservice_legend_font_style', FALSE);

    _remove_variable('cdm_dataportal_geoservice_legend_font_style');

    $cdm_map_distribution['legend']['icon_width'] = variable_get('cdm_dataportal_geoservice_legend_icon_width', 35);

    _remove_variable('cdm_dataportal_geoservice_legend_icon_width');

    $cdm_map_distribution['legend']['icon_height'] = variable_get('cdm_dataportal_geoservice_legend_icon_height', 15);

    _remove_variable('cdm_dataportal_geoservice_legend_icon_height');

    variable_set('cdm_map_distribution', $cdm_map_distribution);

    $tasks_performed[] =  'variables for map settings migrated to new variable "cdm_map_distribution"';