initial commit: Map<key : uri> handling
new IndexBasedCompressor.java data structures
index based Compressing: seems to work, not serializing indexes
Seems to work based upon  dummy.data
data2
harmonizing interfaces: abstract class definitions, not finished but working
abstract interfaces
fixing DefaultGraph
not using interface compressedgrah
abstract interface for CompressedGraph.java, implementing it
added index maps to archive
removing unused imports
added simple serialisation of spo maps
Merge branch 'indexBased' of github.com:KLyko/RDFCompressor into indexBased
Removing redundant parents: a redundant parent of r is also part of the parents list of any parent of r
Merge branch 'indexBased' of github.com:KLyko/RDFCompressor into indexBased
shortened rule string
Merge branch 'indexBased' of github.com:KLyko/RDFCompressor into indexBased
replaced uris in rules by their index
use copy of parents to avoid concurrent modifications.
log time to console, avoid System.outs