RefactorDW Code

Removed warning caused by new Checkstyle 5 rules.

Updated change log.

Email links will be transformed correctly now.

Performance optimization to prevent the writing of an article file when nothing has changed.

Chapter part of a link will be escaped now when creating a regular expression for an article link.

Fixed usage of spaces in links.

Minor change.

Fixed the transformation from relative to absolute links for links containing a chapter only.

- Removed some old and unused logger messages.
- Added more logger messages for unchanged, but manipulated files.

- Fixed generation of regular expressions for article links for links that ended with ":".
- Added warning message for unchanged articles that should have been changed.