changes reults of motifs metrics (% instead of count)
fixes error in motif comparisson
PLOT: added timestamp parameters in plot. methods
ZIP: added metric comparison support for zips
fixed a small bug with comparison directory names

- a naming bug when reading quality metrics would result in a wrong
directory name when multiple metrics were being compared in the same run
added aggregation flag for series generation
PLOT: added utility methods for SeriesData's
PLOT: changes on new utility methods
- pushed auxiliary vars down
- pushed compute() down
- adapted init_(), reset_(), equals()
detailed equals for BC-update
shortest path counting to allow normalization and creating a binned distribution (no update mechanism, due to normalization a recomputation is necessary)
- code formatting
- removed unnecessary code
- removed unused imports
adds a separate weight implementation that can be used by nodes and edges
adds weighted edges and nodes using the new weight implementation
adds empty constructors to all weight implementations
adapts the updates to the changes in weights and changes the string representation

- the new weight implementation for nodes is adapted in node and edge
weight updates
- batch generators are adapted accordingly
- reader and writer are adapted accordingly

also, the string representation of updates is slightly changed
- node removal and node weight change:
  - the node is identified by the index only
- edge removal and edge weight change:
  - the edge is identified by index1 and index2 or the connected ndoes
removes all weighted nodes and edges (now obsolete)
First step of weight refactoring: generate them through GDS

Following: fixing red lights in metrics
WeightedGraph and NullWeight no longer needed - GDS transparently creates weighted elements if needed

This is directly put into the according test cases
Refactored outputting of Weights
Bugfix: assume a minimal initial size of 1