Add test for postLink with escape false + confirm option.

Closes #4008
Remove session.auto_start configuration.

It now fails in PHP >= 5.5.2 . Also it never did anything in earlier
versions as the session would have already been started if auto_start
was true.

Fixes #4010
Adding files to be compared against bake generated files, fixing bake templates in the meantime.

Writing assertContains() or assertRegExp for generated code is a pain and making the test cover most part of it is very difficult.

Things like:
 ```
 } else {
 }
 ```

Are very easy to happen (which was the case) and was not being covered by the test.
Merge pull request #1502 from renansaddam/feature/2.3-baked_files

Adding files to be compared against bake generated files, fixing bake templates in the meantime.