[2.0] Updating sandbox cli to use APC again but adding comment to use ArrayCache if APC is not available

[2.0] Changing sandbox to use ArrayCache by default so it doesn't require APC. Added comment with APC as the recommended for production

[2.0] Updated description for pear packages. Enhanced ClassLoader to support the old namespace separator (underscore) for Zend/PEAR/... compatibility until some day when they all use 5.3+.

[2.0] Work on CLI: Added SchemaToolTask with preliminary support for dropping/creating the database schema. Prepared the sandbox. Adjusted build to include the sandbox.

[2.0] Various necessary fixes and adjustments for oracle as well as fixes for better handling of temporal types. Closed #2452.

[2.0] Made MySqlPlatform default to innodb table engine. Some cleanups while investigating the optimistic locking failures.

[2.0] Moved beginTransaction() in UnitOfWork#commit() out of the try block so that exceptions occuring during prior or on transaction start are not masked by another exception.

[2.0] Implemented base of CLI tasks. Also included drafts of Version and Help tasks. Implemented two Printers: Normal and ANSI Color.

[2.0] Removed *where*In methods from QueryBuilder. Finished decouple of QueryBuilder and Expr. Updated docs.

[2.0] Refactored pieces of QueryBuilder, it does not use string concatenation anymore. Splitted from into from and join, allowing update and delete DQLs to be correctly built. Added missing entry set. Removed Expr\Having because it was useless. Updated docs.

[2.0] Applied fixes for character casing issues. Simplified inheritance mapping and improved handling of outer joins in Class Table Inheritance.

[2.0] More preparations to fix character casing issue. Reverted and completed ConditionalPrimary parsing and added more tests for this.