* changed compatibilty method to static for better testability
* bugfix: formats without any available conversions were not handled
correctly
* added testcases for compatibility check programConfig
* removed conversion via standard format
* using graph conversions within the dataset format conversion
* changed storage of datasets in datasetconfig from List<DataSet> to
Map<String, DataSet>. This stores additionally to every dataset its
alias (section name) in the config file and these alias can be used to
adress single datasets in the program config
* changed package structure -> Clustering to GraphMatching
* implemented parser for compatibility formats building a regular
expression syntax tree
* implemented conversion method to disjunctive normal form (DNF) to
convert compatibility formats to DNF and be able to check for
compatibility easily
Merge branch 'graphmatch' of https://github.com/wiwie/clusteval.git into graphmatch
* merge problems