Added capability to output genome as blocks orders in grimm format from supplide breakpoint graph (has to be at most indel content, no duplication supported)
Added capability to extract single genome graphs from supplied breakpoint graph

Now regualr vertices can be distinguished between head / tail vertices
Block name can be recovered from vetex name
Added a link for vertex mate, so each regular vertex has a reference to another vertex, that represents the extremity of the same synteny block