Coordinate transformation from ECEF to WGS-84 Earth

Tested is the routine for converting (x, y, z) ECEF coordinates to
(\labmda, l, h) WGS-84 Earth coordinates.

Tested known values are taken from LALDetectors.h (several inteferometers'
vertex location).

Routine taken from a Mathworks.

	modified:   modules/ETutils.py
	new file:   tests/ETutils/EarthFixed_to_WGS84Earth.py
	new file:   tests/ETutils/integrate_skyfunc.py
	new file:   tests/ETutils/test_ETusefuls.py
Manually deleted 2 files not needed