Fixes #4812: Fixed search filter
Fixes #4762: Reverted automatic ID fix.
Used aliases for fixture directory definitions
Fixes #4812
Fixes #4247
Fixed method name in docs
Fixes #4126
Fixed grammar
Fixes #3248: described AR transactions, locks, dirty attributes
Fixed example of transactional operations in AR guide
Fixes #4813: Fixed MSSQL schema that was getting incorrect info about constraints
`yii\mongodb\Collection::buildLikeCondition()` fixed to be case insensitive.