Revert "Fixes #1856: The default CSS class for hint generated by `ActiveField` is changed to `help-block`"

This reverts commit 7ae4695d.

fixes #2099

fixes #2094

Just a minor PHPDocs change. In the advanced application there is no such thing as "app\models".

init of advanced application now allows to specify answer for overwriting files  via init --overwrite=n

Fixes #1937: Fixed wrong behavior or advanced app's `init --env` when called without parameter actually specified

Removed error-block HTML class and related styles and used Bootstrap3 standard practice about errors instead

Fixes #1633: fixed scenarios for User model in advanced application allowing setting default values for User model

Advanced app template: moved database connection DSN, login and password to -local config not to expose it to VCS

1. It results in much smaller download and takes less disk space (25MB instead of 180MB for yii-basic + dependencies).
2. It requires less utilities to be installed (no VCS binaries required).
3. It takes less time to install dependencies.

to allow specific styling
also fixed an issue with gridview sort indicator css.

fixes #1000

fixes #1736

fixes #1717