Portability wrapper did not properly use the _defaultFetchMode when the method setFetchMode() was used on the Connection

- 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

Introduced BC break with databases that switch from case-insensitive
to case-senstive handling when identifier quoting is enabled.

This reverts commit 11111bd7.

Quoting table name to avoid errors with:
SELECT * FROM order;