Base

Added support for external class repositories. You can now add a class repository to the autoload mechanism by using the addClassRepository() method.
Added a method to return all configured class repositories.
Added the REMOVE constant to the ezcBaseFileException.
Added the ezcBaseOptions class that serves as base class for all option classes in the components.

Cache

Implemented feature request 7841: Added possibility to provide a TTL of false to make cache items last endlessly.

Fixed problem where rollback would not be performed even though it was the innermost call to it.

Added the ezcDbSchemaPersistentWriter class that writes schema definitions for the PersistentObject component.
Fixed a small bug in the MySQL reader where the "decimal" type was not understood.

Added the getRelatedPartByID() method to ezcMailMultipartRelated that returns a mail part by looking for it's Content-ID.
Added the class ezcMailFileSet that can be used to parse mail messages in a file directly from disk.
Added the class ezcMailVariableSet that can be used to parse mail messages directly from a variable.
Changed the POP3 classes to leave the mail on the server by default. You need to actively set $deleteFromServer in order to have it removed.

Fixed #7884: ezcPersistentSession sometimes triggers PDO "General error: 2014" exceptions.
Fixed #8042: PersistentObject requires use of database ID counter.

Note: The change involves a slight BC incompatible change. ezcPersistentIdentifierGenerator is no longer an interface but an abstract class. Implementors must change 'implements' to 'extends' to reflect this.
Added ezcPersistentManualGenerator which can be used to set the ID's of new object manually.

Fixed issues with escape characters in the single quoted string, double quoted string, and in the Text.
Added functionality that a number can also be specified with an exponent.
Throw an exception when a directory in the compile path could not be created (Because of the file permissions).
Throw an exception when a method from an object is called.