* modifications compliant with new M-Index v. 2.8.0 (renaming of PPCalculator to MIndexInitalizer)

 * parallel & sequential initiator classes merged
 * clear split of two PPP-Code index variants: 
   1) just index without any ID-object store for refinement (class PPPCodeAlgorithm)
   2) "old" variant with the internal int-object store (class PPPCodeAlgorithmRefinement)
 * support of GetCandSetOp
 * refactoring and restructuralization of the approx. navigation processors
 * BUG FIX in PPPCodeObj R&W

* packages with EarthMover's Distance and with Sketch implementation moved to a new project "ppp-codes-private"

 * The GPL header of all files slightly changed