Segregated support of unique index and unique constraint. Added missing commits: 400d73c8a1e4f53459a877c8652811ee22c0913b, e91811cb3fe3101d7d8ac95c45f8bc1ba9bd913a, a4ecf053186b11bc31fbff79ef36248500383908, d7d1c397a35735383b34632d3a67bbc3a3371a45, c71b3ae0425e5c039b047825dbf8351a773e6785, 2f9da39ec645b54d08c95649c99d7b87a32bdc72 and 9aa4e79aab0477b4212b01d65de53193d9559e39

Fix PSR2 rules : "As per PSR2, the static declaration should come after the visibility declaration."

- Fixed docblocks
- Removed return statements on void methods
- Cleaned up unused private / local variables
- Fixed license issues
- Removed SVN leftovers
- Fixed doctrine-project.org links
- Added line breaks before return statements

[2.0][DDC-92] Fixed. Patch provided by Christian Heinrich. [DDC-274] Started some method renaming. [DDC-142] Fixed (join column names and discriminator column names dont support quoting) [DDC-258] Fixed.

[2.0] DDC-169 - Introduced handling of schema / database case-sensitivity differences and to allow compability between different platforms.

[2.0] DDC-169 - Finalized implementation of Schema diff algorithm, added diffs of sequences and foreign keys. Fixed several bugs and changed the API of the Schema objects.

[2.0] - DDC-169 - Began refactoring of DBAL code, introduced object notation for a database schema, including Tables, Indexes, Constraints, Sequences and Columns. Added a CreateSql Visitor which transforms a schema object graph into the required SQL statements to create it. Next: Replacing SchemaTool::getCreateSql() with new syntax...