Update TFEL package (#9995)

* add the tfel package

* fix the tfel package

* fix the tfel package

* fix the tfel package

* Taking Adam J. Steward' remarks into account

* fixes trailing white spaces

* Update description

* Update dependencies following @adamjstewart adices

* Style fixes

* Style fixes

* Add java optional support

* add the maintainers attribute (following @alalazo advice), disable interface not selected (following @adamjstewart advice)

* flake8 fixes

* Fix Cast3M and python-bindings support. Python detection is made compatible with cmake'FindPythonLibs module (at least how it is used in TFEL)

* Style fixes

* Style fixes

* Fix test on python version

* Follow @adamjstewart advices: code is much cleaner and readable

* Small fix

* Small fix

* Add comment

* Small fix in cmake option

* try again (trying to overcome Travis CI unstable build process)