Merge pull request #7 from aim42/master

Merge pull request #74 from rschimmack/master
Reverted changes of links and references

- Reverted changes of links and references.
- Improved some anchor-references.
- Added sonargraph link to references of pattern "Static Code Analysis".
- Fixed broken link "fourth conference on Patterns languages of Program
Design, PLoP97" of "Big-Ball-Of-Mud".
Merge pull request #75 from rschimmack/master

Reverted changes of links and references