Update ActiveRelationTrait.php

Update gii guide.

Hide debug toolbar when media = print

Update model.md

Add `whenClient` description

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

fixes for https://github.com/yiisoft/yii2/issues/951#issuecomment-25934549

Fixes #3091: Fixed inconsistent treatment of `Widget::run()` when a widget is used as a container and as a self-contained object

updated appd-advanced.md

added predefined path aliases of advanced yii application template

1xx status is not that common.

small typos changes

Some fixes for #3074 Hungarian translation

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

if component id is different from 'db'

Update apps-advanced.md

just a type correction and suggestion on adding a comma and one word (ie 'by') to make it more easily to be understand.

#3073 added Hungarian translation

Re-implemented RBAC by following more closely to the original NIST RBAC model. Dropped `yii\rbac\PhpManager`.

Implement ActiveForm and ActiveField

add guide about filtering and sorting related columns