removed unused code $patterns

useTablePefix => useTablePrefix

use tableprefix on gii model generator

typo fix

Fixes #1263: Fixed the issue that Gii and Debug modules might be affected by incompatible asset manager configuration

fix https://github.com/yiisoft/yii2/issues/3050

1xx status is not that common.

without this the form does not allow choosing a different connection id

if component id is different from 'db'

issue #3026