Python interface

[burgerdev]

There are some differences to what the CC class used to be:

• vigra::TinyVector is no longer exported (this is done in vigra)
• the CC class is not exported for float anymore
• messages to stdout were removed
• _import_array() is no longer called during module init
• label type is now unsigned int (int before)
• CC class is now also templated with source type
• Roi has new getter and setter methods for p and q (problem with TinyVector converters)
• removed const from sink TinyVectors for compatibility (they are returned by-value anyways)

[thorbenk]

empty line

[thorbenk]

I would suggest to git rebase --interactive these commits and either squash all or refactor commits into at most three distinct commits

[burgerdev]

I will squash them in the next pull request, but will keep committing here until its ready.

[burgerdev]

squashed in #4