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Original commit for this change: 0b6c4d15

Situation : when two 1D entities of the microstructure boundary have the same endpoints but only one is actually on the border of the unit cell. The second 1D entity can be an circular arc.
E.g.  `pantograph_RVE(1, 1, 1/3, junction_r=r, offset=(0.05, 0.0))`

Gmsh2DPartFromRVE : This function can now be used even when the RVE contains several domains.
pantograph_E11only_RVE : Modified to avoid creating a geometry  with junctions two times thinner on the horizontal borders.

+ Split generate_mesh_2D
+ Offset functions (WIP)

Expression designed for periodic extensionPeriodicExpr is now part of the ho_homog package.Tested with : `demo_pantograph_same_mesh.py`+ Refactoring reconstruction fuction+ minor corrections in geometry sub-package

+ import correction

Change name of boolean operations;
Correction name of plot functions;

create the __all__ list;
minor syntax fixes in geometry sub-modules.