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#1292 Fix many warnings, most of them stemming from the fact Seldon used int for its indexes whereas Xtensor use the more sensible std::size_t.

#1492 Remove Tclap from the library - give it the same status as the others third party libraries that are installed through ThirdPartyCompilationFactory.

#1292 Replace the alias XtensorMatrix and XtensorVector by LocalMatrix and LocalVector. Remove now unused files.

#1292 TMP Elasticity case compiles with XTensor only. Many deactivated to make that work though... Seldon has been removed due to conflicts with Blas files also in Xtensor.

#1292 Use Xtensor for the transient source operator. I used the same trick as reported in previous commit for matrices.

#1292 Use Xtensor for the mass operator. Currently I'm introducing the possibility to use Seldon or Xtensor; it is only temporary and the goal is to use Xtensor everywhere at the end of the day. Some asserts are deactivated and should be adapted and reactivated before closing this ticket.

#859 Add an initialization to please gcc / release (which is totally wrong). It will probably trigger a code smell in Sonarqube as the value thus initialized is never read...

#1490 As the previous test worked, add cppcheck and clang static analysis and see if all is properly taken into account in sonar analysis.

#1490 Replace Python script by shell script to run sonar-scanner. Temporarily deactivate clang static analysis.