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Add tutorial descriptions

See merge request !313

Spanningtreev2

See merge request !312

Plugin(SpanningTree): don't use c++11 regexp to keep backward compatibility with c++98, this comes however at the cost of a poorer parsing and less flexible lists

Improve Plugin(SpanningTree): now parses list of physical + handles curves, surfaces and volumes in an ordered way (replaces the StartOn mecanism)

Fixing non-deterministic behavior in 3D Delaunay algorithm by defining the...

See merge request !310

Fixing non-deterministic behavior in 3D Delaunay algorithm by defining the ordering in the set containing the embedded edges, as otherwise the order to recover these edges will be different all the time, resulting in different meshes.

Test build cpp tutorial

See merge request !309

# Conflicts:
#   CMakeLists.txt

test building+testing c++ tutorials for dynamic builds

See merge request !308

(cherry picked from commit 9ab3eaa4)