Ticket: 134

Ticket: 131

Ticket: 129

Ticket: 126

- Lazy connections possible through Doctrine_Manager::addDSN($dsn, $connectionName). Connections will then be opened automatically when they are requested the first time.

Changes concerning multiple connection control:
- injection of the Connection object into the Doctrine_Table constructor, instead of a static lookup.
- added optional Connection parameter to save/delete of Doctrine_Record and Doctrine_Collection

Refactored Doctrine_Connection: separated into two different classes Doctrine_Connection and Doctrine_Transaction

Doctrine_Record::getID() -> obtainIdentifier()
Doctrine_Record::setID() -> assignIdentifier()

removing the closing PHP tags form all php files, it\'s not needed and can break sessions which are whitespace sensitive

Tests for covering the Doctrine_Collection::loadRelated functionality for basic many-to-many relations

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