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Modified exception classes, new method for connection exceptions getPortableCode(), refactored some classes

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Doctrine now works seamlessly in multi-connection environment where connections are bound to classes

Total rewrite for DQL alias model: now using short aliases instead of long aliases (needed for Oracle portability). 

Both default to TRUE. If set to false, you need to explicitly specify "length" and/or "type" in the parameter of hasColumn that specifies the validators for that column.

Added new exception classes, renamed Doctrine_Repository to Doctrine_Table_Repository, refactored many classes

Ticket: 134

Ticket: 125

- 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

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