* Allow for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Fix geom warnings on windows

* Fix to PR 7165: Remove inline access to static class member

(cherry picked from commit 60890d891df3e18c33d321015966916998680a0b)

* Allow for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Fix geom warnings on windows

(cherry picked from commit 3d545273d7763e09aa85449ba86be5d2493f7f13)

Special algorithm is used now to produce pcon/pgon shape polygons
without inner surface (rmin==0). Where was mistake, which causes problem
when more than 2 z layers was specified.

Avoid double delete by registering to TGeoManager reflected shape assemblies, owned by TGeoVolumeAssemby.

(cherry picked from commit 437486008912b2da317097eaf7ea8f2ea1a822c4)

This fixes the following compilation errors on Windows:
TGeoTessellated.cxx(385,67): error C2027: use of undefined type 'std::array<CellVec_t,1000000>'

And on MacOS:
TGeoTessellated.cxx:385:23: error: implicit instantiation of undefined template 'std::__1::array<std::__1::vector<int, std::__1::allocator<int> >, 1000000>'
      auto grid = new std::array<CellVec_t, ngrid * ngrid * ngrid>;
                      ^

Prevent failing of tutorials tests, while web geom viewer does not
support batch

Use override declarations for re-implemented virtual methods

Idea to implement only few methods for display of TGeoVolume 

Only dummy implementation was provided, 
never can be used that way

Instead of "not implemented" comment just put "= delete" specifier

Has same problem copying pointers on owned arrays

Was implemented, bur definitely wrong, while copy pointer on owned
objects

Has many dynamic-allocated members, therefore should be implemented
explicitely, if required 

More safe way to override virtual methods

Was not absolutely clear that array not yet allocated.

Fixing travis wanring

Was not implemented correctly, cannot be used

CSG requires closed shape, therefore points should be reused

Use less number of points, build closed figures - important for CSG

When internal surface does not exists - do not try to build it.
Copy and paste solution from pgon