Added db_is_table_exists and a few fixes

[Jessyy]

Added db_is_table_exists. Fixed a problem when using 'db_rewind' (warning 209: function "db_rewind" should return a value). Fixed a problem when db_set_asynchronous(DB:db, true/false) always will be DB::SYNCHRONOUS_OFF... now will be: * db_set_asynchronous(DB:db, true) -> DB::SYNCHRONOUS_OFF * db_set_asynchronous(DB:db, false) -> DB::SYNCHRONOUS_FULL !!! My advice about this function ('db_set_asynchronous') seems pointless, removeit Minor fix db_get_field_float return type from 'return 0' to 'return 0.0'.

I have a question why these functions are like this: stock db_rewind(DBResult:dbrResult) { stock db_set_row_index(DBResult:dbrResult, iRow) { stock db_free_result_hook(DBResult:dbrResult) { stock db_set_synchronous(DB:db, DB::e_SYNCHRONOUS_MODE:iValue) { stock stmt_bindvalue(&DBStatement:stStatement, iParam, DBDataType:iType, {Float, }:...) { stock stmt_skip_row(&DBStatement:stStatement) { stock db_dump_table(DB:db, const szTable[], const szFilename[]) { when they should be stock bool:db_rewind(DBResult:dbrResult) { stock bool:db_set_row_index(DBResult:dbrResult, iRow) { stock bool:db_free_result_hook(DBResult:dbrResult) { stock bool:db_set_synchronous(DB:db, DB::e_SYNCHRONOUS_MODE:iValue) { stock bool:stmt_bindvalue(&DBStatement:stStatement, iParam, DBDataType:iType, {Float, }:...) { stock bool:stmt_skip_row(&DBStatement:stStatement) { stock bool:db_dump_table(DB:db, const szTable[], const szFilename[]) {

[oscar-broman]

Thanks your contribution!

You're right - they should be tagged with bool.