[FIX] Fixing connectedComponents().

Use standard Union-Find data structure instead of traversal algorithm that appears to be non-working anyway.
[FEATURE,INTERNAL] The auto_build.py script now also create source tarballs.

git-svn-id: http://svn.seqan.de/seqan/trunk@14742 e6417c60-b987-48fd-844e-b20f0fcc1017
Merge pull request #7 from holtgrewe/hotfix/connected_components

[FIX] Fixing connectedComponents().