rem: void db_close(db_con_t* _h)
add: void db_close(db_con_t* handle)
context: void db_close(db_con_t* _h){	DLOG("db_close", "entry");	if(! _h)	{		PLOG("db_close", "no handle passed, ignored");		return;	}	disconnect_db(_h);	aug_free(_h);}