Added CFG_ENABLED_SEARCH_INTERFACES and CFG_DEFAULT_SEARCH_INTERFACE config variables in order to choose which search modes ('avanced', 'simple' or new experimental 'super-simple') are enabled, and which of them is the default search mode. Also added CFG_WEBSEARCH_SUPERSIMPLESEARCH_PATTERN_BOX_WIDTH to choose search box width in super-simple search mode (similar to CFG_WEBSEARCH_SIMPLESEARCH_PATTERN_BOX_WIDTH and CFG_WEBSEARCH_ADVANCEDSEARCH_PATTERN_BOX_WIDTH)