Seperate internal/external implementation of segmentations. Remove some ID tags - do no longer make sense in git.

Segmentation driver for ScECAL stips MegatileLayerGridXY.cpp/h are updated to fix a problem which shows wrong hit positions.

   - updated release notes
   - increased version number
   - set DD4HEP_USE_CXX11 ON

 Added new MegatileLayerGridXY segmentation for Scintillator strip Ecal, which is implemented by K.Kotera, and used by SEcal04Hybrid geometry driver.

 Updated TiledLayerGridXY segmentation, and added two functions to set and access the layer identifier string, which may be defined in the compact xml file.

 Updated WaferGridXY, allow to set and access different Magic wafer group. SiWEcal Barrel has different Magic Wafer size in each layer group, and SiWEcal Endcaps has different Magic Wafer size in each tower group.

 Added a WaferGridXY cartesian segmentation for SiWEcal. The SiWEcal include both Normal wafer and Magic wafer depending on the layer dimensions. Implemented a new algorithm to transfor the SiWEcal04 sensitive driver into DD4hep framework. This algorithm works for both Normal and Magic wafer design.

 - fixed module id for calo barrel surfaces
 - ...

 Added a new AHcal Barrel sensitive tiling driver - TiledLayerGridXY in DDSegmentation for AHcal Barrel Sensitive layer segmentation design.

 - updated release notes

   - release notes and versions

Implement cellDimensions Functions for PolarGridRPhi and PolarGridRPhi2
Implement unit tests
Correct documentation string in CartesianGrid[XY]Z

Needed to access cell dimensions in a segmentation agnostic way
Implemented unit tests for cellDimensions
Implemented default function throwing exception
Implemented cellDimensions for CartesianGridXY, XZ, YZ, XZY
Added c++11 definition to DD4hep.cmake (implemented functions with and without c++11)

Add example segmentation and document parameters for setGridRValues and setGridPhiValues

some missing characters
missmatch in function signatures due to using std::string

Fix: phi/theta Coordinate calculation was not updating the cellID
     Create protected functions no taking cellIDs, make public functions update the cellID for the decoder
     Make position update the cellID for the decoder and use the private phi/theta functions

Fix: Change type for thetaBins and phiBins members, they should be integer (at least the setters only allowed int)

Tweaks: Use CellID instead of long64 (same typedef)

* protect against self assignment
* delete NULL is a no-op, don't need to check