Changes for more resonable partitioning:

[bska]

• option to not remove anything from partitioning graph
• added possibility for setting overlap
• changed export list: need testing in particular in parallel (if it is intended to work there)

[bska]

jenkins build this please

[blattms]

This has a very brief description. It is a bit hard to understand those bullet points. Please make it more detailed and explain the improvements.