Change-Id: I93b64fb00477c0632a6fa3573800dd7609d25db0
'GetUserBlock': Modify the block found by the block manager. This may be a
single block or a composite block made from multiple blocks; the original
blocks can be seen using CompositeBlock::getOriginalBlocks()
+$user: User targeted by the block
+$ip: string|null The IP of the current request if $user is the current user
+ and they're not exempted from IP blocks. Null otherwise.
&$block: AbstractBlock object
'getUserPermissionsErrors': Add a permissions error when permissions errors are