Improved access to source code and bug tracker

In an effort to simplify contributions from the community, we've reorganized the content on scopeforge.de a bit, in particular:

• the ECR bug and enhancement tracker and the roadmap are now available publicly
• there's a new tracker for community change requests
  
• there's also a new forum for general questions and discussions
• last but not least we've provided build instructions for Linux
  

In addition to that, we've also re-organized the Help & Support and Development pages on this site.