This allows for example to retrieve the DEM elevation for a
latitude/longitude pair.

This can be used to set up min/max search lines.

This is still preliminary work, convergence seems slightly wrong.

Conflicts:
	src/test/java/org/orekit/rugged/api/RuggedTest.java

Some attitude laws constructors used in tests have been deprecated.

This reverts commit b61d7ead.

This reverts commit 3ff8b559.

This reverts commit 294d3a57.

This reverts commit 6c8742ea.

This helps caller to set fix the min/max lines as we can provide
information about where the point is expected.