Moved tutorials to a separate sister project.

README.md

src/changes/changes.xml

src/site/markdown/building.md

src/site/markdown/tutorial/attitude.md

src/site/markdown/tutorial/frames.md

src/site/markdown/tutorial/geomagnetic-field.md

src/site/markdown/tutorial/integration-in-other-languages.md

...te/markdown/tutorial/propagation-in-non-inertial-frame.md

src/site/markdown/tutorial/propagation.md

src/site/markdown/tutorial/time.md

src/site/site.xml

...t/estimation/leastsquares/DSSTOrbitDeterminationTest.java

...rekit/estimation/leastsquares/OrbitDeterminationTest.java

...t/estimation/sequential/KalmanOrbitDeterminationTest.java

src/test/java/org/orekit/utils/SecularAndHarmonicTest.java

src/tutorials/java/fr/cs/examples/KeyValueFileParser.java

...orials/java/fr/cs/examples/attitude/EarthObservation.java

src/tutorials/java/fr/cs/examples/bodies/DEFile.java

src/tutorials/java/fr/cs/examples/bodies/Phasing.java

.../java/fr/cs/examples/conversion/PropagatorConversion.java