guide WIP [skip ci]
Moved yii\rest\Controller::checkAccess() to ActiveController.
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Tests excess dump removed
improved debugger on handling unreadable files

issue #3494
guide WIP
added note about GET method to ActiveForm

fixes #3353
Merge pull request #3496 from LAV45/fix

Tests excess dump removed
fixed broken link
Update ErrorAction.php
Update Controller.php
Merge pull request #3499 from ShNURoK42/master

Rename errorHandler to getErrorHandler()
guide WIP [skip ci]
guide WIP [skip ci]